ICSE Class 9 Biology Sample Question Paper

ICSE Class 9 Biology Sample Question Paper 4 with Answers

Section -I
(Attempt all questions from this section)

Question 1.
(a) Name the following :
(i) The two types of devices commonly used for removing the particulate air pollutants, (ill The category of immunity required in the treatment of snake bite.
(iii) Any agent that causes cancer.
(iv) Organism that transmits disease-causing microbes.
(v) The condition in which lactic acid accumulates in our muscles and gives the feeling of fatigue.
Answer:
(i) Scrubbers and electrostatic precipitators
(ii) Artificially acquired passive immunity
(iii) Carcinogen
(iv) Vectors
(v) Oxygen debt

(b) Choose the correct answer from each of the four options given below :
(i) If for some reason the sebaceous glands fail to function, then :
(a) The body will not be able to regulate the body temperature.
(b) The skin will turn darker with more melanin,
(c) The hairs will fail to grow.
(d) The skin will turn dry and rough.
Answer:
(d) The skin will turn dry and rough.

(ii) Which of the following consist of 3 bones ?
(a) Ear ossicles
(b) Neck vertebrae
(c) Tarsals
(d) Phalanges
Answer:
(a) Ear ossicles

(iii) Which one of the following do bacteria possess ?
(a) Mitochondria
(b) Ribosomes
(c) Golgi body
(d) Vacuole
Answer:
(b) Ribosomes

(iv) Which one of the following are called as amphibians of plant kingdom ?
(a) Thallophytes
(b) Gymnosperms
(c) Bryophytes
(d) Pteridophytes
Answer:
(c) Bryophytes

(v) The number of ATP produced during aerobic respiration is :
(a) 2
(b) 36
(c) 38
(d) 40
Answer:
(c) 38

(c) Fill in the blanks :
(i) Parenchyma cells containing chloroplasts are termed as ………………..
(ii) Flower containing only carpels are called ………………..
(iii) The protective coverings of ovule is called ………………..
(iv) The scientific name of house cat is …………………..
(v) ……………….formation in bacteria is a method of escaping unfavourable environmental conditions.
Answer:
(i) Chlorenchyma
(ii) Pistillate flower
(iii) Integument
(iv) Felis domesticus
(v) Spore

(d) Choose the odd one and categorize the rest under one group.
(i) Euglena, Paramecium, Amoeba, Toadstool.
(ii) Liverfluke, Tapeworm, Ascaris, Planaria.
(iii) Parotid, Gastric, Submandibular, Sublingual.
(iv) Sternum, Lumbar, Sacrum, Cranium, Humerus.
(v) Larynx, Bronchioles, Alveolar sac, Ileum.
Answer:

(i) Odd : Toadstool
Category : Kingdom Protista

(ii) Odd : Ascaris
Category: Phylum Platyhelminthes

(iii) Odd: Gastric Category : Salivary glands

(iv) Odd: Humerus
Category : Bones of axial skeleton

(v) Odd: Ileum
Category : Parts of respiratory tract

(e) Statement given below are incorrect. Correct the following statements by changing the first word only.
(i) Arthropodes move by means of tube feet.
(ii) Mycelium is the swollen tip of Rhizopus where spores get matured.
(iii) Vitamin B3 deficiency causes pernicious anaemia.
(iv) HCl activates inactive trypsinogen to active trypsin.
(v) Iodine solution is used to test the presence of glucose.
Answer:
(i) Echinoderms move by means of tube feet.
(ii) Sporangium is the swollen tip of Rhizopus where spores get modured.
(iii) Vitamin B₁₂ deficiency causes pernicious anaemia.
(iv) Enterokinase activates inactive trypsinogen to active trypsin.
(v) Fehling’s solution is used to test the presence of glucose.

(f) State one point of difference between the following pairs according to the guidelines given in brackets.
(i) Kingdom Monera and Kingdom Protista (nuclear material)
(ii) Iron and Iodine (disease caused due to their deficiency)
(iii) Sucrase and Lactase (function)
(iv) Meibomian glands and Ceruminous glands (location)
(v) Oxygen and Carbon dioxide (mode of transport in our body)
Answer:
(i)

Kingdom Monera	Kingdom Protists
The organisms that belongs to kingdom Monera have nuclear material that lies free in cytoplasm without being enclosed in nuclear envelope. They do not have an organized nucleus.	Protists have a well-defined nucleus with nuclear material enclosed within nuclear envelope.

(ii)

Iron	Iodine
Iron deficiency causes anaemia.	Iodine deficiency causes simple goitre and cretinism in children.

(iii)

Sucrase	Lactase
Sucrase converts sucrose into glucose and fructose.	Lactase converts lactose into glucose and galactose.

(iv)

Meibomian glands	Ceruminous glands
Meibomian glands are modified sebaceous glands which open on the margins of the eyelids.	Ceruminous glands are also modified sebaceous glands found in auditory canal.

(v)

Oxygen	Carbon dioxide
Oxygen is transported in the form of oxy-haemoglobin carried by RBCs throughout the body.	Carbon dioxide is transported in the form of bicarbonates dissolved in plasma or in combination with haemoglobin as carbamino haemoglobin by RBCs.

(g) Complete the following table by filling in the numbered blanks with an appropriate answer :

Answer:
(i) Smaller peptides + Amino acids
(ii) Lipase
(iii) Fatty acids + glycerol
(iv) Maltose
(v) Peptidase
(vi) Amino acds
(vii) Proteins
(viii) Peptides
(ix) Rennin
(x) Paracasein

(h) Given below is an overall chemical reaction of a certain process.
C₆H₁₂O₆ → Lactic acid + 2ATP + Energy
(i) Identify the process.
(ii) Is this reaction applicable to animals or plants or both ?
(iii) Name one tissue where this reaction occurs.
(iv) Give the reaction for complete oxidation of glucose. What is this process called ?
(v) Give the site in our body where complete oxidation of glucose occurs.
Answer:
(i) It is anaerobic respiration.
(ii) It occurs in animals.
(iii) This reaction mainly occurs in skeletal muscles.
(iv) C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + 38 ATP + Energy/Heat
It is called aerobic respiration.
(v) It occurs mainly in mitochondria.

Section – II
(Attempt any four question from this section)

Question 2.
(a) Study the figure and answer the following:

(i) Identify the figure.
(ii) To which kingdom does it belong ?
(iii) Label the parts 1-5.
(iv) What is the function of part labelled 3 and 5 ?
(v) How does it reproduce ?
Answer:
(i) It is a bread mould or rhizopus.
(ii) It belongs to kingdom fungi.
(iii) 1-Sporangium, 2-Sporangiophores, 3-Spores, 4-Stolon, 5-Hyphae.
(iv) Sporangium bursts to release the spores which gets scattered by wind and under suitable conditions like temperature, substratum, moisture the spores germinate to give rise to new mycelium. Hyphae penetrate into the substratum (like bread) and secrete some enzymes which digest the food in the bread and then it is absorbed by rhizopus.
(v) It reproduces by asexual reproduction.

(b) Give the exact location of the following :
(i) Capsule
(ii) Sclerenchyma
(iii) Columnar epithelium
(iv) Aleurone layer
(v) Sublingual glands
Answer:
(i) Capsule is a slimy protective layer present outside to the cell wall in bacteria.
(ii) Sclerenchyma is found in stems and veins of leaves.
(iii) Columnar epithelium is found in inner lining of stomach and intestines.
(iv) Aleurone layer is the outermost layer of endosperm rich in protein and is found in maize grain.
(v) Sublingual glands are salivary glands found below the tongue.

Question 3.
(a) Write few characteristics of following tissues with suitable diagrams :
(i) Sclerenchyma
(ii) Parenchyma
(iii) Collenchyma
Answer:
(i) Some characteristics of sclerenchyma are :

1. They are dead, long, narrow cells.
2. Their cell walls are thick due to deposition of lignin.
3. They provide strength to plant parts.
4. They are closely packed without intercellular spaces.

(ii) Some characteristics of parenchyma are :

1. They are large oval, circular or polygonal shaped cells with thin walls.
2. They have single large vacuole.
3. They are found in cortex and pith regions of plant.
4. They have abundant intercellular spaces. Space
5. They provide temporary support to plants and some store food as in potatoes.

(iii) Some characteristics of collenchyma are :

1. They are elongated cells with cell walls thickened at the comer.
2. They are found in leaf stalks and below epidermis of stems.

(b) Study the diagram and answer the following questions :

(i) Identify the structure and state its main role.
(ii) Label the parts 1-5.
(iii) What is function of parts labelled 1 and 5 ?
(iv) Is this structure present in all cells ? If not, name the cell in which it is absent.
Answer:
(i) It is nucleus. Its main role is to regulate and coordinate various life processes of cell and play an important role in cell division. It is the controlling centre of the cell, so it is also known as brain of the cell.
(ii) 1-Chromatin fibres, 2-Nuclear membrane, 3-Nucleoplasm, 4-Nuclear pore, 5-Nucleolus.
(iii) Chromatin fibres are thread-like structures which are bearer of genes that control hereditary characters.
Nucleolus produces ribosomes and participates in protein synthesis by storing and forming RNA.
(iv) No, it is absent in matured human RBCs.

Question 4.
(a) Answer the following questions briefly :
(i) What are antagonistic muscles ? Give one example.
(ii) Why Negroes have dark coloured skin while Europeans have light coloured skin ?
(iii) Give some symptoms of Hepatitis and Cholera.
(iv) Give some uses of antibiotics.
(v) Give main activities of Red Cross.
Answer:
(i) A muscle that opposes the action of another muscle is called antagonistic muscle. They generally occur in pairs. Example- biceps and triceps. Biceps bend the lower arm over the upper arm while straightening of lower arm is brought about by triceps.

(ii) Pigment melanin present in malpighian layer of our skin is responsible for the colouration of our skin. Different quantities of this pigment present in our skin lead to formation of very light brown to dark colouration of the skin. Negroes have generally more amount of melanin as compared to Europeans, so Negroes have dark coloured skin while Europeans have light coloured skin.

(iii) Symptoms of Hepatitis are body ache, deep yellow urine, yellowish eye, light coloured stools, nausea, vomiting, enlarged liver, loss of appetite, fever etc. Symptoms of cholera are severe diarrhoea, vomiting, no urination due to shortage of water in body.

(iv) Some uses of antibiotics are :
1. They are used as medicines to fight infections.
2. Some are used as food preservatives.
3. Some are used for controlling plant pathogens.
4. Some are used in treating animal feed to prevent internal infections.

(v) Main activities of Red Cross are :
1. To extend relief and help to the victims of calamity like floods, fire, famine, earthquake.
2. To procure and supply blood for needy victims of war or other calamities.
3. To provide possible first aid in any accident and arrange ambulance services during emergencies.

(b) Study the figure given below and answer the following questions :
.
(i) Identify the figure.
(ii) Label the parts 1-7.
(iii) How is thigh bone and pelvis connected together ? Name the type of joint present between thigh bone and pelvis.
(iv) Name three bones present in our hip bone.
(v) Give the function of pelvic girdle.
Answer:
(i) The figure shows the hind limb.
(ii) 1-Femur, 2-Patella, 3-Tibia, 4-Fibula, 5-Tarsals, 6-Meta tarsals, 7-Phalanges.
(iii) The thigh bone i.e., head of femur fits into the large cup-shaped articular cavity called acetabulum of hip bone.
Ball and socket joint is present between thigh bone and pelvis.
(iv) Ilium, ischium and pubis are three bones present in our hip bone.
(v) It gives support to the skeleton of hind limbs and also protects and supports our abdominal organs.

Question 5.
(a) Give reasons :
(i) Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole.
(ii) Mitochondria is called the powerhouse of the cell.
(iii) Humans have heterodont and diphyodont dentition.
(iv) Person feels breathlessness at higher altitudes.
(v) Small intestine is the most important organ of our digestive system.
Answer:
(i) Meristematic cells are actively dividing cells so they have a prominent nucleus with dense cytoplasm. As they are in continuous dividing state hence they don’t need to store food or waste material, so they lack vacuoles.

(ii) Mitochondria is the site where glucose is oxidized to release energy in the form of ATP. The energy is stored in the form of ATP and is used in various metabolic activities, thus it is known as powerhouse of the cell.

(iii) In human beings the teeth are of different shapes, so this type of dentition is called heterodont and teeth appear in two sets during their lifetime i.e., milk teeth and permanent teeth’. So, this type of condition is called diphyodont dentition.

(iv) At higher altitudes air pressure decreases as well as oxygen content decreases, so we feel difficulty in breathing and lack of oxygen causes dizziness, loss of hearing, unsteady vision etc.

(v) Small intestine is the region where maximum digestion of food occurs by enzymes of pancreatic juice secreted by pancreas and intestinal juice secreted by intestinal glands. Maximum absorption of digested food also occurs here. So, it is the most important organ of our digestive system.

(b) Study the figure below and answer the following question :

(i) Identify the figure.
(ii) To which phylum this organism belongs ?
(iii) Name the disease caused by this organism in human beings. How does this disease mainly spread ?
(iv) Give few characteristics of the organisms belonging to phylum mentioned by you in Q. (ii) above.
(v) Give few examples of the organisms belonging to phylum mentioned by you in Q. (ii) above.
Answer:
(i) It is Taenia solium, a tape worm.
(ii) Platyhelminthes.
(iii) Taeniasis : It is spread by eating infected pork and beef.
(iv) Few characteristics are :

• They are small, soft, flattened, unsegmented worms without a body cavity.
• Alimentary canal has one opening i.e, mouth.
• They are mainly parasites, few are free living.

(v) Liverfluke, Planaria.

Question 6.
(a) The following diagram refers to an apparatus which is used to demonstrate a physiological process.

(i) What is the purpose of keeping KOH solution in the test tubes X and Y ?
(ii) Why has coloured water risen in tubing 1 ?
(iii) What is the purpose of keeping boiled peas soaked in disinfectant in test tube Y ?
(iv) Name the biological process which causes the above rise.
(v) Define the biological process shown in the experiment.
Answer:
(i) KOH solution absorbs carbon dioxide if it is produced by seeds.

(ii) In tube 1, seeds undergo respiration i.e., it takes in oxygen and releases carbon dioxide. Carbon dioxide is absorbed by KOH solution and as oxygen present in tube is slowly used up, so a vacuum is created in tube X and coloured water from beaker rises in tubing 1.

(iii) They acts as a control because as seeds are boiled so they are dead and they cannot respire. The seeds are soaked in disinfectant so that there would be no growth of microbes which may interfere with the results of the experiment.

(iv) Respiration

(v) Respiration is a catabolic process by which glucose is oxidized to release energy in presence of oxygen and this energy produced is used to carry out various life processes.

(b) Give the exact function of the following :
(i) Seed coat
(ii) Nucellus
(iii) Sepals
(iv) Epithelial tissue
(v) Epiglottis
Answer:
(i) Seed coat is a protective layer consisting of outer testa and inner tegmen. It protects the delicate inner parts of the seed from injury and from the attack of bacteria, fungi and insects.

(ii) Nucellus is a mass of food laden cells that surrounds embryo sac and it protects the embryo as well as provides reserve food material to the developing embryo.

(iii) Sepals protect the young flower bud and when it is in green colour, it performs photosynthesis process.

(iv) Epithelial tissue when present in skin serves as protective layer, in intestine it helps in absorption and secretion and sensory perception.

(v) Epiglottis is a muscular flap-like structure which closes the opening of trachea so that food cannot enter respiratory tract and it will pass through the oesophagus.

Question 7.
(a) Study the figure given below and answer the following questions :

(i) What does figure A and figure B represent ?
(ii) Label the parts as indicated in figure above.
(iii) Explain the mechanism demonstrated in figure A and figure B.
(iv) What is the breathing rate in normal adults ?
Answer:
(a) (i) Figure A represents inhalation and figure B represents exhalation process of breathing.

(ii) 1-Air is drawn in, 2-Ribs moving upward and outward, 3-Diaphragm contracts, 4r-Diaphragm relaxes, 5-Air is forced out, 6-Ribs move inwards and downwards.

(iii) During inhalation process, ribs move upwards and outwards due to contraction of external intercostal muscles, thus chest cavity enlarges. Diaphragm contracts and flattens thus chest cavity increases lengthwise. The pressure inside lungs decreases so outside air rushes inside.

(iv) Breathing rate is 12-18 breaths per minute.

(b) Give scientific terms for the following :
(i) The process of putting the organic waste matter to decay to form manure by help of earthworms.
(ii) Mild chemical substances applied on body to kill germs.
(iii) The tidal air contained in air sacs.
(iv) The outer membranous covering of lungs.
(v) The narrowing of blood vessels to reduce blood supply when temperature is low outside.
(vi) The non-functional organs in our body.
(vii) The process by which excess amino acids are broken down in the liver.
(viii) The arrangement or condition of teeth in a particular individual or species.
(ix) Fibrous undigested cellulose in our body.
(x) The casting off and regrowing of exoskeleton in arthropods.
Answer:
(i) Vermicomposting
(ii) Antiseptics
(iii) Alveolar air
(iv) Parietal pleural membrane
(v) Vasoconstriction
(vi) Vestigeal organs
(vii) Deamination
(viii) Dentition
(ix) Roughage
(x) Moulting

ICSE Class 9 Biology Question Papers with Answers

ICSE Class 9 Biology Sample Question Paper 3 with Answers

Section -1
(Attempt all questions from this section)

Question 1.
(a) Name the following :
(i) A common phase in both aerobic and anaerobic respiration.
(ii) Method of the naming of organisms.
(iii) Inactivated toxins but can still cause the body to make antibodies.
(iv) Type of germination where cotyledons remain underground.
(v) The condition of suffering in our body due to deficiency of some essential elements of food.
Answer:
(i) Glycolysis
(ii) Binomial nomenclature
(iii) Toxoids
(iv) Hypogeal germination
(v) Malnutrition

(b) Choose the correct answer from each of the four options given below :
(i) Red Cross Day is celebrated on :
(a) September 17
(b) November5
(c) May 8
(d) June 5
Answer:
(c) May 8

(ii) The most rapidly increasing and much harmful waste today is :
(a) Municipal sewage
(b) Plastics
(c) Pesticides
(d) Electronic waste
Answer:
(b) Plastics

(iii) The germ causing hepatitis is transmitted through :
(a) The bite of a mosquito
(b) Contamination of food by housefly
(c) Personal contact with a patient
(d) Contaminated water
Answer:
(d) Contaminated water

(iv) During inspiration, diaphragm :
(a) Relaxes
(b) Gets folded
(c) Contracts
(d) Expands
Answer:
(c) Contracts

(v) The visible part of hair is :
(a) Shaft
(b) Root
(c) Papilla
(d) Bulb
Answer:
(a) Shaft

(c) Fill in the blanks :
(i) The liquid found inside vacuoles is called ……………….
(ii) ………………. is responsible for increase in diameter of the stem.
(iii) Elephophily is found in ………………. flower.
(iv) Birds lay eggs with shells.
(v) ………………. is a free-living nitrogen fixing bacteria in the soil.
Answer:
(i) Cell sap
(ii) Cambium
(iii) Rafflesia
(iv) Calcareous
(v) Azotobacter

(d) The statements given below are incorrect. Correct the following statements by changing the last word only :
(i) The cells in stratum comeum are made up of protein melanin.
(ii) Result of anaerobic respiration in muscles cells is pyruvic acid.
(iii) The first cervical vertebrae is called axis.
(iv) Trypsinogen is converted into activated trypsin by HCl.
(v) Absence or shortage of vitamins in diet over a continued period causes hereditary diseases.
Answer:
(i) The cells in stratum comeum are made up of protein keratin.
(ii) Result of anaerobic respiration in muscles cells is lactic acid.
(iii) The first cervical vertebrae is called atlas.
(iv) Trypsinogen is converted into activated trypsin by enterokinase.
(v) Absence or shortage of vitamins in diet over a continued period causes deficiency diseases.

(e) Match the items of Column I with those in column II and rewrite the correct matching pairs

Column I	Column II
(i) Scorpion (ii) Earthworm (iii) Bacteria (iv) Xerophthalmia (v) Osteomalacia	(a) Calciferol (b) Capsule (c) Clitellum (d) Arthropoda (e) Retinol

Answer:

Column I	Column II
(i) Scorpion (ii) Earthworm (iii) Bacteria (iv) Xerophthalmia (v)  Osteomalacia	(d) Arthropoda (c) Clitellum (b) Capsule (e) Retinol (a) Calciferol

(f) Choose the odd term and categorize the rest under one group.
(i) Beriberi, Pellagra, Rickets, Marasmus, Pernicious anaemia.
(ii) Penicillum, Rhizopus, Mucor, Aspergillus, Streptococcus pneumonie.
(iii) Dogfish, Starfish, Jellyfish, Crayfish, Cuttlefish.
(iv) Sieve tubes, Fibres, Companion cells, Vessels.
(v) Cholera, Typhoid, Chicken pox, Tuberculosis, Diabetes.
Answer:
(i) Odd : Marasmus
Category : Vitamin deficiency diseases

(ii) Odd : Streptococcus pneumonie
Category: Fungi

(iii) Odd : Dogfish
Category : Invertebrates

(iv) Odd: Vessels
Category : Components of phloem

(v) Odd : Diabetes
Category : Infectious or communicable diseases

(g) Given below are five s ets of terms. Rewrite the terms in correct order in a logical sequence beginning with the term that is underlined.
(i) Trachea, Alveoli, Bronchioles, Larynx, Nostrils.
(ii) Sacrum, Coccyx, Lumbar, Thoracic, Cervical vertebrae.
(iii) Phalanges. Humerus, Carpal, Radius-ulna, Metacarpal, Pectoral girdle.
(iv) Bolus, Salivary amylase, Mouth. Oesophagus, Peristalsis, Stomach.
(v) Fertilization, Germination of pollen grain, Pollination. Growth of pollen tube towards ovary, Formation of fruits and seeds.
Answer:
(i) Nostrils, Larynx, Trachea, Bronchioles, Alveoli.
(ii) Cervical vertebrae, Thoracic, Lumbar, Sacrum, Coccyx.
(iii) Phalanges, Metacarpal, Carpal, Radius-ulna, Humerus, Pectoral girdle.
(iv) Mouth, Salivary amylase, Bolus, Oesophagus, Peristalsis, Stomach.
(v) Pollination, Germination of pollen grain, Growth of pollen tube towards ovary, Fertilization, Formation of fruits and seeds.

(h) Give the exact function of the following :
(i) Xylem
(ii) Fibrous connective tissue
(iii) Bile
(iv) Foramen magnum
(v) Erector muscle
Answer:
(i) Xylem is a conducting tissue which conducts water upwards from roots to leaves and other parts of the plant.

(ii) Fibrous connective tissue form tendons and ligaments which connect bones to muscles and bone to bone respectively.

(iii) Bile neutralizes the acid content of food received from stomach and makes it alkaline so that enzymes from pancreatic juice and intestinal juice can act on various components of food and convert them into simpler form. It emulsifies fats i.e., it converts large fat globules into small droplets.

(iv) Foramen magnum is a hole in the back of cranium from which spinal cord emerging from brain continues behind the backbone.

(v) Erector muscles contracts and pulls the hair to vertical position and form goosebumps to produce heat, mainly during winter season when body is cold.

Section – II
(Attempt any four questions from this Section)

Question 2.
(a) Study the diagram given below and answer the following questions :

(i) What does the figure represent ?
(ii) Label the parts 1-6.
(iii) What is the function of this cell ?
(iv) What is the function of the part labelled 1 and 6 ?
(v) Where is this cell likely to be found in the human body ?
Answer:
(i) The figure represents structure of a neuron/nerve cell.
(ii) 1-Dendrites, 2-Nucleus, 3-Cyton, 4-Nodes of Ranvier, 5-Axon terminals, 6-Axon.
(iii) Neuron conducts nerve impulses to different parts of the body. It is concerned with perception of stimuli and provides responses to the received stimuli. It transmit information to other nerve cells, muscles or glands.
(iv) Dendrites receive the impulses and transmit it into cyton.
Axons are the long cytoplasmic processes of neuron which carry impulses away from cyton.
(v) It is associated with nervous system of our body i.e., brain, spinal cord, cranial nerves, spinal nerves etc.

(b) Study the diagram and answer the following questions :

(i) Identify the type of tissue and give a reason to support your answer.
(ii) Identify parts 1-4 labelled in the figure above.
(iii) What are the functions of part labelled 1-4 ?
(iv) Where is this-tissue located ?
Answer:
(i) It is phloem tissue as the cells show cellular contents.
(ii) 1-Sieve plate, 2-Sieve cell, 3-Phloem parenchyma, 4-Companion cell.
(iii) Sieve plates are perforated which allow water and dissolved organic solutes to flow along the sieve tubes.
Sieve cell transports food from leaves to storage organs and other parts of the plant. Phloem parenchyma stores starch, fats and other organic food material. Companion cell helps in functioning of sieve tube cells.
(iv) It is found in leaves and stem of plants to transport manufactured food from leaves to other parts of the plant.

Question 3.
(a) The figure represents a part of a flower. Study it carefully and answer the following questions:

(i) Identify the part of flower. What is the collective term for this organ known as ?
(ii) What is the main function of this part in a flower ?
(iii) Label the parts indicated in the figure.
(iv) Give the function of parts labelled 1 and 2.
Answer:
(i) It is the male reproductive organ of a flower called stamen. A group of stamens is collectively known as androecium.
(ii) It produces male gametes that play an important role in reproduction process.
(iii) 1-Pollen grains, 2-Anther, 3-Filament, 4-Stamen.
(iv) Pollen grains carry the male gamete which is transferred from anther to stigma of flower for fertilization process.
Anther produces the pollen grains which carry the male gametes.

(b) Answer the following questions briefly.
(i) Name three kinds of muscles found in human body and the places in the body where they are found.
(ii) What are nectaries and what is its function ?
(iii) What do you mean by hydrophilous flowers ? Give few characteristics of these flowers with an example.
(iv) Differentiate between respiration and breathing.
(v) Why do we shiver and our teeth chatter when it is very cold in winter ?
Answer:
(i) Three kinds of muscles found in our body are :
1. Striated/skeletal/striped/voluntary muscles : They move according to our will and are found in arms, legs, face, neck etc.

2. Unstriated/ smooth/ unstriped/ involuntary muscles : They do not move under our control or will. They are found in walls of intestine, iris muscles of eye, urinary bladder, uterus, lining of blood vessels etc.

3. Cardiac muscles : They are found in the walls of heart only and are involuntary in function.
(ii) Nectaries are group of nectar (which is a sweet fragrant liquid) secreting cells and they are situated usually at the base of petals or pistils. The nectar secreted by these cells attract insects like honeybees for cross pollination.
(iii) Hydrophilous flowers are those flowers whose pollination is done by water.
Some characteristics of these flowers are :
1. Flowers are colourless and small.
2. Pollen grains are light, long ribbon-like structures.
3. Flowers do not contain nector.
Example : Vallisneria

Respiration	Breathing
Respiration is a biochemical process.	Breathing is a physical process.
Respiration includes intake of oxygen, utilization by cells to release energy.	Breathing is simply taking in of oxygen dioxide and giving out carbon

When outside temperature is low during winter, our body temperature starts to fall, so as to maintain our body heat. Hypothalamus initiates some mechanisms to generate body heat. There is sudden contraction of our body muscles which generate heat by shivering and our body temperature increases, feeling us warm. Teeth chattering is a form of shivering which keeps us warm.

Question 4.
(a) Study the figure given below and answer the following questions :

(i) What does the figure represent ?
(ii) Label the parts 1-10.
(iii) Which is known as windpipe and how is it protected ?
(iv) Why is it advised to breathe through nose and not through mouth ?
(v) Name the functional unit of lungs.
Answer:
(i) The figure represents respiratory system of human beings.
(ii) 1-Nasal cavity, 2-Nostrils, 3-Larynx, 4-Pharynx, 5-Trachea, 6-Left bronchus, 7-Right bronchus, 8-Right lung, 9-Left lung, 10-Diaphragm.
(iii) Trachea is known as windpipe and it is protected by C-shaped cartilaginous rings which provide flexibility and keep it in distended condition.

(iv) Nostrils have fine hairs which trap large particles like dust and other foreign particles present in air and prevent them from entering into the respiratory tract. Nasal chamber warms and moistens the air and its mucous secretion traps the harmful particles letting dust and germ free air into our body. Thus, we should breathe through nose and not through mouth.
(v) Alveoli

(b) Differentiate the following :
(i) Actively acquired immunity and Passively acquired immunity.
(ii) Vaccination and Immunization.
(iii) Degradable and Non-degradable wastes.
(iv) Hinge joint and Ball and socket joint.
(v) Digestion in mouth and Digestion in stomach.
Answer:
(i)

Actively acquired immunity	Passively acquired immunity
It is the resistance developed by the individual due to. previous infection which might enter the body naturally or introduced artificially by vaccination.	Immunity acquired by an individual from an outside source in the form of readymade antibodies.

(ii)

Vaccination	Immunization
Vaccination is the process of artificially introducing of dead or weakened germs or germ substances into our body to develop resistance for a particular disease.	Immunization is the process of developing resistance to disease- producing germs or their toxins by introducing killed germs to induce production of specific antibodies.

(iii)

Degradable waste	Non-degradable waster
Degradable waste gets converted into simpler, non-toxic form by the action of microbes or other chemical means. Examples : Animals waste, agricultural residues, peels of vegetables, fruits etc.	Non-degradable substances cannot be degraded by the action of microbes or other chemical process. Examples : Plastics, metals, glass, electronic wastes etc.

(iv)

Hinge joint	Ball and Socket joint
Hinge joint moves like a hinge of door in one plane only. It is found in elbow joint, knee joint.	Ball and socket joint is found in shoulder joint and hip joint which allows movement in all direction.

(v)

Digestion in mouth	Digestion in stomach
In mouth, mainly starch is digested by the action of ptyalin enzyme of saliva and is converted into maltose.	In stomach, proteins are mainly digested by the action of pepsin enzyme and are converted into polypeptides.

Question 5.
(a) Study the figure given below and answer the following questions :

(i) What process does figure A and figure B represent ?
(ii) Label the parts 1-4 as indicated in the figures.
(iii) Define the process represented in figure A and B respectively.
(iv) Give some names of the agents that help in these processes.
(v) Give two advantages and disadvantages of the process represented in figure A.
Answer:
(i) Figure A represents self pollination and figure B represents cross pollination.
(ii) 1-Stigma, 2-Anther, 3-Petal, 4-Sepal.
(iii) Self pollination is the transfer of pollen grains from anther to stigma of same flower or stigma of another flower but in same plant. Cross pollination is the transfer of pollen grains from anther to stigma of flowers in different plants but of same species.
(iv) Some agents which help in pollination are water, wind, insects, birds, animals etc.
(v) Advantages of self pollination are :
1. Parental characters are preserved.
2. No need to produce large number of pollen grains for pollination.

Disadvantages :
1. It does not yield new varieties.
2. The defective or weaker character cannot be eliminated.

(b) Give biological terms for the following :
(i) The process by which seed germinates inside the fruit attached to the parent plant.
(ii) The opening through which pollen tube enters the embryo sac for fertilization.
(iii) The condition in which anther and stigma occupy different heights.
(iv) Chemicals found in the blood which acts against antigens.
(v) The wave of contraction and relaxation in gut to push the food.
(vi) The process of heating at very high temperature to kill microbes.
(vii) Animals whose body temperature remains constant.
(viii) The method of grouping living organisms based on their similarities and differences.
(ix) The first phase of breaking down of glucose in cytoplasm.
(x) The protective sheath of radicle.
Answer:
(i) Viviparous germination
(ii) Micropyle
(iii) Heterostyly
(iv) Antibodies
(v) Peristalsis
(vi) Sterilization
(vii) Homeothermic animals
(viii) Classification
(ix) Glycolysis
(x) Coleorhiza

Question 6.
(a) Answer the following questions related to our skin :
(i) Write a brief note on epidermis layer of skin.
(ii) State some functions of skin.
(iii) List four ways in which the skin serves as a protective layer for our body.
(iv) What is melanin ? State its function also.
Answer:
(i) Epidermis is the outermost thin layer of the skin which has three layers :
1. Stratum comeum which is the outermost layer made up of dead cells. These cells are made up of structural protein keratin. These cells get replaced continuously. This layer is tough and provide resistance against bacterial infection, mechanical damage and loss of water by evaporation.

2. Granular layer is thin middle layer which gives way to outermost comified layer.

3. Malpighian layer is the innermost layer which actively divides to produce new cells to replace worn out cells of corneum layer. Pigment melanin is present in this layer which protects us from harmful UV rays of sun.

(ii) Some functions of skin are :
1. It prevents the entry of disease-causing germs, harmful UV rays of sun.
2. It provides sensation for touch, pain, pressure, heat etc.
3. It regulates our body temperature.
4. It excretes out excess water, salts in the form of sweat.
5. It helps in synthesis of vitamin D when exposed to sunlight.
6. It stores reserve food in the form of fat layer.

(iii) The four ways in which skin serves as a protective layer are :
1. It protects us from harmful UV rays of sun.
2. It prevents excessive loss of water by evaporation thus conserves our body fluids.
3. It protects the underlying tissues from injury and mechanical shocks.
4. It prevents entry of harmful substances and disease-causing germs into our body.

(iv) Melanin is a pigment present in the cells of malpighian layers which provides colouration to our skin. It also protects our body from harmful effects of the UV rays of sun.

(b) Study the diagram given below and answer the following questions :

(i) Name the parts labelled 1-7.
(ii) Identify the type of tooth and give a reason to support your answer.
(iii) Which is the hardest substance in our body ?
(iv) Describe the part labelled 3.
(v) What are the different types of teeth present in human beings ? Also state their function.
Answer:
1-Enamel, 2-Dentine, 3-Pulp, 4-Cement, 5-Crown, 6-Neck, 7-Root.
(ii) It is either an incisor or canine teeth as it has only one root.
(iii) Enamel
(iv) Pulp is the soft connective tissue found in the pulp cavity of the tooth which consists of blood capillaries, lymph vessels and nerve fibres.
(v) There are four different types of teeth :
1. Incisors for cutting and biting.
2. Canines for holding and tearing the food.
3. Premolars for grinding and crushing the food.
4. Molars for grinding and crushing the food.
5. It helps in synthesis of vitamin D when exposed to sunlight.
6. It stores reserve food in the form of fat layer.

Question 7.
(a) Study the diagram given below and answer the questions that follow :

(i) Label the parts.
(ii) Give some functions of human skeleton.
(iii) What constitute our rib cage ?
(iv) Name the bones of leg.
(v) What are girdles ? Mention its types.
Answer:
(a) (i) 1-Cranium, 2-Mandible, 3-Clavicle, 4-Stemum, 5-Rib cage, 6-Humerus, 7-Ulna, 8-Radius, 9-Carpals, 10-Metacarpals, 11-Phalanges, 12-Vertebral column.
(ii) Some functions of human skeleton are :
1. It provides support and shape to our body.
2. It protects our delicate organs.
3. They bring about movement.
4. They are storehouse of calcium and phosphorus.
5. Some bone marrow of long bones helps in formation of blood cells.
(iii) 12 pairs of ribs along with thoracic vertebrae and sternum forms our rib cage.
(iv) Tibia, fibula, tarsals, metatarsals, phalanges, femur and patella.
(v) Girdles are the part of skeleton which help to articulate the limb bones to the axial skeleton. They are of two types-shoulder pectoral girdle and hip pelvic girdle.

(b) Study the diagram given below and answer the following questions :

(i) What processes are depicted in figure A and B ?
(ii) An error is there in the figure above. Can you point out the error ?
(iii) What does the following represent in our body :
1. Bell jar
2. Balloons
3. Rubber sheet
4. Tube
(iv) Give the significance of this process in our body.
Answer:
Breathing process i.e., inspiration and expiration.
(ii) In figure B since balloons are inflated, so rubber sheet should be pulled inwards towards the bell jar.
(iii) 1. Thoracic cavity
2. Lungs
3. Diaphragm
4. Trachea and bronchi
(iv) Breathing is a very important process by which we take in oxygen gas and give out carbon dioxide. By inhalation process, we take in oxygen for breaking down of glucose to release energy which is required to carry out our metabolic activities. The harmful carbon dioxide gas released by oxidation of glucose is removed from our body by exhalation process.

ICSE Class 9 Biology Question Papers with Answers

ICSE Class 9 Biology Sample Question Paper 2 with Answers

Section -1
(Attempt all questions from this section)

Question 1.
(a) Name the following :
(i) The lubricating fluid around a movable skeletal joint.
(ii) The method of disposal of waste by burning.
(iii) The drug based on arsenic compound produced in 1910 which killed germs of syphilis.
(iv) Maximum air which can, at any time, be held in the two lungs.
(v) Modified sebaceous glands found in auditory canal which secrete ear wax.
Answer:
(i) Synovial fluid
(ii) Incineration
(iii) Salvarsan
(iv) Total lung capadty
(v) Ceruminous glands

(b) Choose the correct answer from each of the four options given below :
(i) A particular species of which one of the following, is the source bacterium of the antibiotic discovered next to penicillin for the treatment of tuberculosis
(a) Escherichia
(b) Streptomyces
(c) Rhizobium
(d) Nitrobacter
Answer:
(b) Streptomyces

(ii) Fat soluble vitamins are :
(a) A, D and E
(b) B, C and D
(c) B, D and E
(d) A, B and C
Answer:
(a) A, D and E

(iii) The enzymes found in intestinal juice are :
(a) Trypsin, amylase, lactase
(b) Steapsin, lipase, erepsin
(c) Maltase, lipase, erepsin
(d) Sucrase, trypsin, steapsin
Answer:
(c) Maltase, lipase, erepsin

(iv) Which one of the following categories of vertebrae are correctly numbered ?
(a) Sacral – 4
(b) Thoracic – 10
(c) Lumbar – 4
(d) Cervical – 7
Answer:
(d) Cervical – 7

(v) Anaerobic respiration normally occurs in :
(a) Grass
(b) Coconut
(c) Cactus
(d) Baker’s yeast
Answer:
(d) Baker’s yeast

(c) Fill in the blanks :
(i) The fluid mosaic model of plasma membrane was given by …………….
(ii) The covering of muscle fibre is …………….
(iii) The whorl of floral leaves outside the sepal is called …………….
(iv) The pollen tube enters the ovule through the …………….
(v) The outermost cover of the seed is …………….
Answer:
(i) Singer and Nicolson
(ii) Sarcolemma
(iii) Epicalyx
(iv) Micropyle
(v) Testa

(d) Match the items of column I with those in column II and rewrite the correct matching pairs :

Column I	Column II
(i) Flower stalk	(a) Involuntary
(ii) Tendon	(b) Pedicel
(iii) Cardiac muscle	(c) Connect muscle to bone
(iv) Trachea	(d) Site of gaseous exchange
(v) Alveoli	(e) Windpipe

Answer:

Column I	Column II
(i)  Flower stalk (ii) Tendon (iii) Cardiac muscle (iv) Trachea (v)  Alveoli	(b) Pedicel (c) Connect muscle to bone (a) Involuntary (e) Windpipe (d) Site of gaseous exchange

(e) Identify the odd term in each set and name the category to which the remaining 3 belong :
(i) Lysol, Benzoic acid, DDT, Mercurochrome.
(ii) Cholera, Typhoid, Tuberculosis, Malaria.
(iii) Pleura, Trachea, Bronchi, Pericardium.
(iv) Caecum, Duodenum, Ileum, Jejunum.
(v) Sucrose, Maltose, Lactose, Fructose.
Answer:
(i) Odd: DDT
Category: Antiseptics

(ii) Odd : Malaria
Category: Bacterial diseases

(iii) Odd : Pericardium
Category : Parts of respiratory system

(iv) Odd : Caecum
Category : Parts of small intestine

(v) Odd : Fructose
Category : Disaccharides

(f) Mention the exact location of the following :
(i) Epiglottis
(ii) Subcutaneous fat layer
(iii) Scapula
(iv). Caecum
(v) Stigma
Answer:
(f) (i) Epiglottis is flap-like structure located at the entrance of windpipe.
(ii) Subcutaneous fat layer are layers of fat cells found beneath the dermis.
(iii) Scapula is a flat triangular shaped bone which lies dorsally on upper ribs on either side of vertebral column in the thorax region.
(iv) Caecum is situated at the junction of small intestine and large intestine.
(v) Stigma is located at the top of pistil.

(g) Differentiate between the following pairs on the basis of guidelines given in brackets :
(i) Chicken pox and AIDS (causative agent)
(ii) Red Cross and WHO (main role)
(iii) Hypoxia and Asphyxiation (definition)
(iv) Hinge joint and Ball and Socket joint (location)
(v) Pepsin and Ptyalin (function)
Answer:

(i)

Chicken pox	AIDS
Causative agent is Varicella Zoster Virus (VZV).	Causative agent is Human Immuno- denficiency Virus (HIV).

(ii)

Red Cross	WHO
The main role of Red Cross is to extend relief and help to the victims of calamity like flood, earthquake, fire, famine etc.	The main role of WHO is to collect and supply information about occurrence of diseases of epidemic nature.

(iii)

Hypoxia	Asphyxiation
Hypoxia is a condition in which body or region of body is deprived of adequate oxygen supply at the tissue level.	Asphyxiation is the condition in which blood becomes more venous due to accumulation of carbon dioxide and the oxygen supply is diminished.

(iv)

Hinge joint	Ball and Socket joint
Hinge joint is found in elbow between humerus and ulna, bones of finger and toes, knee joint.	Ball and socket joint is found in shoulder joint where head of humerus fits into socket of shoulder girdle.

(v)

Pepsin	Ptyalin
Pepsin acts on protein and converts it into peptides.	Ptyalin acts on carbohydrate and coverts it into maltose and glucose.

(h) Study the diagram given below and answer the following questions :

Identify the cell A and B. Give reason in support of your answer.
(ii) List the structures present in both cells A and B.
(iii) Name the structures found only in plant cells and those found only in animal cells.
(iv) Name the powerhouse of the cell.
(v) What is the site of protein synthesis ?
Answer:
(i) Cell A is plant cell because it contains cell wall, chloroplasts, large vacuoles. Cell B is animal cell as cell wall and chloroplasts are absent and centrosome is present.
(ii) The structures present in both cells are mitochondria, nucleus, cell membrane,
endoplasmic reticulum, golgi complex, ribosomes etc.
(iii) Cell wall, chloroplasts are present only in plant cells whereas centrosome is found only in animal cells.
(iv) ‘Mitochondria
(v) Ribosomes

Section – II
(Attempt any four questions from this section)

Question 2.
(a) Study the diagram given below and answer the following :

(i) Label the parts 1-8 as indicated in diagram above.
(ii) Name the digestive glands labelled in the diagram. Also name their secretions.
(iii) Give the names of enzymes secreted by part 4 and write their functions.
(iv) In which part of the given figure, mostly water is absorbed ?
Answer:
(i) 1-Oesophagus, 2-Stomach, 3-Liver, 4-Pancreas, 5-Large intestine, 6-Small intestine, 7-Anus, 8-Vermiform appendix.
(ii) Digestive glands are pancreas and liver and their secretions are pancreatic juice and bile respectively.
(iii) Enzymes secreted by pancreas are :
1. Pancreatic amylase : It acts on starch and converts to maltose.
2. Trypsin : It acts on proteins and polypeptides to produce smaller peptides and amino acids.
3. Steapsin : It acts on emulsified fats and converts to fatty acids and glycerol.
(iv) Water is mostly absorbed in large intestine.

(b) Answer the following briefly :
(i) Give the postulates of cell theory.
(ii) Give some characteristics of meristematic tissues.
(iii) Define inflorescence and placentation.
(iv) Mention some conditions which favour cross pollination.
(v) Why do we not use the terms maize fruit or maize seed ? What do we say instead ?
Answer:
(i) The postulates of cell theory are :
1. The cell is the basic and smallest unit of structure of all living beings.
2. All organisms are made up of one or more cells.
3. All cells arise from pre-existing cells.

(ii) Some characteristics of meristematic tissues are :
1. They are actively dividing cells present in growing regions of roots and shoots.
2. They are small, cubical with thin cell wall and large nucleus.
3. These cells are tightly packed with almost no intercellular spaces.
4. Vacuoles are absent but other cell organelles are present in large numbers.

(iii) Inflorescence is the mode of arrangement of flowers on the axis of the plant. Placentation is the manner in which ovules are arranged or attached to the wall of the ovary.

(iv) Some conditions which favours cross pollination are :
1. Unisexuality i.e., if the flowers are either male or female and born on separate plants. Example : Papaya which has separate male and female trees.
2. Self sterility where stigma cannot receive pollen grains from anthers of same flowers.
3. Herkogamy where pollen grains cannot reach stigma of same flower due to some mechanical or structural barriers.
4. Dichogamy where anther and stigma of same flower mature at different times.

(v) We do not use the term maize fruit or maize seed, instead we called it as maize grain as it is a one seeded fruit where fruit wall and seed coat are fused together to form a protective layer.

Question 3.
(a) Study the diagram given below and answer the following questions :

(i) What does the figure represent?
(ii) Label the parts 1-10.
(iii) What is the function of part labelled 3 ?
(iv) What is the fate of part 3 and 7 after fertilization ?
(v) What do you mean by double fertilization ?
Answer:
(a)  The figure represents germination of pollen grain and fertilization process.
(i) 1 – Pollen grain, 2 – Stigma, 3 – Pollen tube, 4 – Style, 5 – Ovule, 6-Embryo sac, 7 – Ovary, 8 – Polar nuclei, 9 – Micropyle, 10 – Nucellus.
(iii) Function of pollen tube is to transport male gamete cell from stigma to the ovule for
the process of fertilization.
(iv) After fertilization, ovules develop into seeds and ovary forms the fruit.
(v) The process in which one male nucleus fuses with egg cell nucleus to form zygote while other male nucleus fuses with two poiar nuclei to form endosperm is called double fertilization.

(b) Give biological term for the following :
(i) Biological catalysts which alter the rate of a biochemical reaction.
(ii) The organisms which possess both the sex organs in one individual.
(iii) The immediate treatment and care given to a person who has suddenly fallen sick or met with an accident till the time medical team arrives.
(iv) The period between the entry of germs and appearance of first symptoms ofthe disease.
(v) The immunity acquired by an individual from an outside source.
(vi) The air breathed in and out in a normal quiet breathing.
(vii) Complete loss of pigmentation of skin all over the body.
(viii) The process of breaking down of large fat globules into tiny droplets.
(ix) The process in which microbes break down carbohydrates into simpler products in the absence of oxygen.
(x) The incomplete breakdown of organic matter by bacteria emitting foul smell.

Answer:
(i) Enzymes
(ii) Hermaphrodite
(iii) First-aid
(iv) Incubation period
(v) Passively acquired immunity
(vi) Tidal volume
(vii) Aibmism
(viii) Emulsification
(ix) Fermentation
(x) Putrefaction

Question 4.
(a) Study the diagram below and answer the questions that follow :

(i) What are the conditions necessary for germination of seed ?
(ii) Name a solution which absorbs oxygen.
(iii) Why in the figure above middle seed germinates but not top and bottom seed ?
(iv) Define germination.
(v) Draw a structure of a matured embryo of a bean seed labelling all its major parts
Answer:
(a) (i) Suitable temperature, water and oxygen are essential conditions required for germination of seeds.
(ii) Alkaline pyrogallic acid.
(iii) The seed placed in middle gets both water and oxygen which are required for germination process, so it germinates. But top seed gets only air/ oxygen but no water, similarly, bottom seed gets water only but very limited oxygen. So, they can not germinate.
(iv) The process of formation of seedling from the embryo is called germination.
(v)

(b) Give reasons :
(i) Cells are generally small in size.
(ii) Xylem and phloem are called conducting tissues.
(iii) Germinated grams are considered highly nutritive.
(iv) Respiration is said to be reverse of photosynthesis.
Answer:
(i) Small size of cells provide large surface area to volume ratio for greater diffusion of substances in and out of the cell. Also, they can communicate with each other raplidy to function effectively.

(ii) Xylem conducts water and mineral salts from roots upwards to the leaves and other parts of the plant. Similarly, phloem conducts manufactured food from leaves to the other parts of plants both upwards and downwards. Hence, they are called conducting tissues.

(iii) Seeds contain endosperm, which stores food for the developing plants. When seed germinates, this complex food material is converted into diffusible form so that it can be used for growth. Hence, germinated gram seeds are considerd to be highly nutritive.

(iv) Respiration is a catabolic process where glucose breaks down to release carbon dioxide and energy, whereas photosynthesis is an anabolic process where glucose is synthesized using carbon dioxide and water. In respiration, oxygen is utilized and carbon dioxide is released but in photosynthesis, oxygen is released and carbon dioxide is utilized. So, respiration is said to be reverse of photosynthesis.

(v) A fluid called synovial fluid which is found within joints provides lubrication and reduces friction, but with age, this fluid gets dried up and due to loss of calcium in bones, they lose their strength and become weak. So, old people complain of stiff joints.

Question 5.
(a) Study the diagram and answer the following :

(i) What does the figure represent ?
(ii) Label the parts 1-8.
(iii) Which is called voice box and why ?
(iv) How is the part labelled 7 protected ?
(v) Name the parts in sequence through which atmospheric air reaches the air sacs
Answer:
(a)
(i) The figure represents respiratory system of human being.
(ii) 1-Nasal passage, 2-Larynx, 3-Bronchioles, 4-Alveoli, 5-Diaphragm, 6-Bronchi, 7-Lungs, 8-Trachea.
(iii) Larynx is called voice box as it contains vocal cords which vibrates when air is
expelled out forcibly through it, thus, producing sound.
(iv) Lungs are protected by rib cage and membranous covering called pleura; the outer parietal and inner visceral layer with pleural fluid in between. The fluid provides lubrication during contraction and expansion of lungs.
(v) Nostrils → nasal cavity → pharynx → larynx → trachea → bronchi → bronchioles → alveolar ducts→ alveoli.

(b) Give causes and symptoms of the following diseases :
(i) Marasmus
(ii) AIDS
(iii) Malaria
(iv) Cholera
(v) Tuberculosis
Answer:
(i) Marasmus is caused usually in infants below 1 year age due to deficiency of carbohydrates, fats and proteins in diet. Symptoms are less body weight, skin become loosely fold, thin face and limbs, retarded physical and mental growth, ribs appear prominent from outside.

(ii) AIDS is caused due to sexual intercourse with infected individual, contaminated blood transfusion, shared injection needles, infected mother to child during pregnancy. Symptoms are fever, night sweats, weight loss and swollen lymph nodes,

(iii) Malaria is caused by a protozoan Plasmodium which is transmitted through saliva of female Anopheles mosquitoes. Symptoms are chills, high fever, nausea, vomiting, headache etc.

(iv) Cholera is caused by a special bacterium called Vibrio cholera which is spread through contaminated food and water. Symptoms are vomiting, severe loose motions, little or no urination, muscle cramps, abdominal pain, dehydration etc.

(v) Tuberculosis is caused by rod-shaped bacteria Mycobacterium tuberculosis and spread from sputum of infected persons. Symptoms are persistent cough, fever during afternoon, chest pain, breathlessness, bloody mucus, loss of weight, fatigue etc.

Question 6.
(a) Give two examples each of the organisms belonging to the following category :
(i) Protista
(ii) Fungi
(iii) Cnidaria
(iv) Porifera
(v) Mollusca
Answer:
(i) Euglena, amoeba
(ii) Yeast, penicillium
(iii) Jelly fish, hydra
(iv) Bathsponge, sycon
(v) Snail, octopus.

(b) The figure below represents the microscopic structure of human skin. Study the same and answer the following questions :

(i) Label the parts 1-8.
(ii) How does the skin help in maintaining body temperature ?
(iii) How does the skin protect our body from germs and UV rays ?
(iv) Name any two modifications of sebaceous glands.
(v) State the functions of parts 1 and 5.
Answer:
(a) (i) 1-Hair shaft, 2-Sweat pore, 3-Sebaceous gland, 4-Sweat gland, 5-Fat, 6-Dermis,7-Epidermis, 8-Blood vessels.

(ii) When outside temperature is high, skin loses extra heat by dilation of blood vessels which results in sweating. As sweat evaporates, it provides cooling sensation. But when outside temperature is low, the blood vessels get constricted, so blood supply is reduced preventing loss of heat leading to less or no sweating, thus conserving heat to keep us warm.

(iii) A pigment called melanin is present in malpighian layer of the skin which protects the inner parts of body from harmful effects of UV rays of sun. Sebaceous glands secrete sebum which prevents the entry of germs into our body.

(iv) Meibomian glands and ceruminous glands

(v) Function of part 1 : Hair provides sensation of touch, prevents entry of foreign particles. Function of part 5 : Fat layer serves as food reserve and shock absorber.

Question 7.
(a) The following set-up was arranged to prove a particular physiological process in plants. Study the same and answer the following questions :

(i) Name the physiological process being studied.
(ii) What is the function of soda lime in the bottle A and why is lime water placed in bottle B ?
(iii) What change would you expect to observe in bottle D ?
(iv) If bottle C was fitted with a three holed rubber stopper and a thermometer was introduced in such a way that its bulb reaches close to the germinating seeds, what would you observe ?
(v) Represent the physiological process named in (i) above in the form of a chemical equation.
Answer:
(i) Carbon dioxide is given off from germinating seeds during the respiration process.
(ii) Soda lime absorbs carbon dioxide from the air which enters the tube. Lime water is placed in bottle B to check whether the incoming air is free from carbon dioxide or not as it turns milky in the presence of carbon dioxide gas.
(iii) Lime water turns milky as carbon dioxide is given out by germinating seeds by respiration process.
(iv) As heat is also evolved during respiration, so if a thermometer is inserted in bottle C, there would be rise in mercury level.
C₆H₁₂O₆ + 6  O₂ —» 6CO₂ + 6H₂O + Energy

(b) Study the diagram below and answer the following questions :

(i) What does the diagram represent ?
(ii) How leguminous plants help in nitrogen fixation ?
(iii) Name the bacteria that converts :
1. Ammonium compounds to nitrites
2. Nitrites to nitrates
(iv) How are nitrates in the soil converted to nitrogen ?
(v) How plants and animals play an important role in the formation of ammonium compounds ?
Answer:
(i) Nitrogen cycle
(ii) Leguminous plants contain Rhizobium in their root nodules which pick up free nitrogen from atmosphere and convert it into soluble nitrates which can be used by plants. This process is called nitrogen fixation.
(iii) 1. Nitrosomonas
2. Nitrobacter
(iv) Denitrifying bacteria are present in soil which converts nitrates present in soil into nitrogen.
(v) Nitrogenous wastes are present in dead remains of plants and animals which are converted into ammonia by bacteria. Ammonia is then converted into ammonium compounds. In this way, plants and animals play an important role in the formation of ammonium compounds.

ICSE Class 9 Biology Question Papers with Answers

ICSE Class 9 Biology Sample Question Paper 1 with Answers

Max Marks :80
[2 Hours]

General Instructions

• Answers to this Paper must be written on the paper provided separately.
• You will not be allowed to write during the first 15 minutes.
• This time is to be spent in reading the Question Paper.
• The time given at the head of this Paper is the time allowed for writing the answers.
• Attempt all questions from Section I and any four questions from Section II.
• The intended marks for questions or parts of questions are given in brackets [ ].

Part-I 
(Attempt all questions from this part) [40 Marks]

Question 1.
(a) Name the following : [5]
(i) The region of the axis between the point of attachment of cotyledons and the plumule.
(ii) The undigested cellulose which is fibrous in nature.
(iii) A vaccine for Poliomyelitis.
(iv) A large hole at the back of the cranium through which the spinal cord passes.
(v) A serious food poisoning disease caused due to a bacterium in tinned foods.
Answer:
(a) (i) Epicotyl
(ii) Roughage
(iii) Salk’s vaccine
(iv) Foramen magnum
(v) Botulism
(b) Given below are sets of five terms each. Rewrite the terms in correct order in a logical sequence beginning with the term that is underlined. [5]
(i) Sacrum, Thoracic, Coccyx, Cervical, Lumbar.
(ii) Larynx, Pharynx, Bronchioles, Nostrils. Alveoli.
(iii) Pollen tube, Stigma, Ovary, Pollen grain. Embryo sac.
(iv) Rectum, Pharynx. Oesophagus, Duodenum, Stomach.
(v) Nuclear membrane, Cell wall. Cytoplasm, Nucleolus, Cell membrane.
Answer:
(b) (i) Cervical, Thoracic, Lumbar, Sacrum, Coccyx.
(ii) Nostrils, Pharynx, Larynx, Bronchioles, Alveoli.
(iii) Pollen grain, Stigma, Pollen tube, Ovary, Embryo sac.
(iv) Pharynx, Oesophagus, Stomach, Duodenum, Rectum.
(v) Cell wall, Cell membrane, Cytoplasm, Nuclear membrane, Nucleolus

(c) Differentiate between the following pairs on the basis of guidelines given in the brackets : [5]
(i) Tendon and Ligament (function)
(ii) Parotid gland and Sublingual gland (location)
(iii) Tidal volume and Residual volume (volume of air)
(iv) Leucoderma and Albinism (type of disorder)
(v) Epidemic disease and Endemic disease (example)
Answer:
(i)

Tendon	Ligament
Tendons connect muscle to bone.	Ligaments connect bone to bone and hold them in position.

(ii)

Parotid gland	Sublingual gland
Parotid glands are located just in front of and beneath each ear.	Sublingual glands are located just below the tongue.

(iii)

Tidal volume	Residual volume
Volume of air is 500 mL.	Volume of air is 1500 mL.

(iv)

Leucoderma	Albinism
Leucoderma is loss of skin pigmentation from smaller or larger patches at different regions of the body.	Albinism is complete loss of  pigmentation of the skin all over the body including hair, eyebrows, iris and eyelashes.

(v)

Epidemic disease	Endemic disease
An example of epidemic disease is plague.	An example of endemic disease is yellow fever.

(d) Mention the exact location of the following : [5]
(i) Pancreas
(ii) Ovules
(iii) Centrosome
(iv) Sternum
(v) Ceruminous glands
Answer:
(d) (i) Pancreas is located behind the stomach.
(ii) Ovule is located inside ovary or it is the inner cavity of the ovary.
(iii) Centrosome is a region surrounding the centrioles located near the nucleus.
(iv) Sternum is a long flat bone lying in the middle of the front part of the chest.
(v) Ceruminous glands are modified sebaceous glands found in auditory canal of ear.

(e) Choose the correct answer from each of the four options given below : [5]
(i) The barrier between the protoplasm and the outer environment in a plant cell is :
(a) Nuclear membrane
(b) Plasma membrane
(c) Tonoplast
(d) Cell wall
Answer:
(d) Cell wall

(ii) The term neuter is given to a flower in which both :
(a) Calyx and Corolla are present
(b) Calyx and Corolla are absent
(c) Androecium and Gynoecium are present
(d) Androecium and Gynoecium are absent
Answer:
(c) Androecium and Gynoecium are present

(iii) In Vallisneria, pollination takes place by the agency of :
(a) Water
(b) Wind
(c) Birds
(d) Insects
Answer:
(a) Water

(iv) The group of plants having naked seeds is :
(a) Angiosperms
(b) Bryophyta
(c) Pteridophyta
(d) Gymnosperms
Answer:
(d) Gymnosperms

(v) Mammary glands are modified :
(a) Sweat glands
(b) Gastric glands
(c) Tear glands
(d) Sebaceous glands
Answer:
(a) Sweat glands

(f) Match the items given in Column I with the most appropriate ones in Column II and rewrite the correct matching pairs.

Column I	Column II
(i) Patella	(a) Maize flowers
(ii) Adult man	(b) Plasmodium
(iii) E-waste	(c) Knee joint
(iv) Anemophilous	(d) Plastic
(v) Malaria	(e) 16 teeth in each jaw
	(f) Mobile batteries
	(g) Elbow joint
	(h) 14 teeth in each jaw

Answer:

Column I	Column II
(i) Patella (ii) Adult man (iii) E – waste (iv) Anemophilous (v) Malaria	(c) Knee joint (e) 16 teeth in each jaw (f) Mobile batteries (a) Maize flowers (b) Plasmodium

(g) Choose the odd one out from the following terms given and name the category to which the others belong : [5]
(i) Carbolic acid, Boric acid, DDT, Benzoic acid.
(ii) Hepatitis, Cholera, Chicken pox, AIDS.
(iii) Vegetable peel, Syringes, CDs, Styrofoam.
(iv) Shark, Dogfish, Starfish, Trout.
(v) Gram seed, Pea seed, Rice, Bean seed.
Answer:
(i) Odd: DDT
Category: Antiseptics
(ii) Odd : Cholera Category: Viral diseases
(iii) Odd : Vegetable peel
Category: Non-biodegradable wastes
(iv) Odd : Starfish
Category : Belong to class pisces and are vertebrates
(v) Odd: Rice
Category: Dicotyledon seeds

(h) Given below is a diagram depicting a physiological process in man. Study the same and answer the following questions : [5]

(i) Name the process occurring in the diagram.
(ii) Explain the process mentioned in part (i).
(iii) Label the gases ‘X’ and ‘Y’.
(iv) Write a balanced chemical equation for the process shown.
(v) Name the organelle where cellular respiration takes place.
Answer:
(i) Tissue respiration
(ii) Blood capillaries contain RBCs which bring oxygen in the form of oxyhaemoglobin. The oxygen is delivered to the body cells or tissues by diffusion through the walls of blood capillaries. Similarly, carbon dioxide released from tissues is picked up by capillaries. Carbon dioxide is transported either as bicarbonates soluble in plasma or in combination with haemoglobin.
(iii) X is oxygen and Y is carbon dioxide.
(iv) C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy
(v) Mitochondria

Section – II
(Attempt any four questions from this part)

Question 2.
(a) Study the diagram and answer the questions that follow : [5]

(i) Label the parts 1-4.
(ii) Give the function of parts labelled 3, 4 and 6.
(iii) Name the protein present in the part labelled ‘1’
(iv) Name the pigment that gives colour to the skin.
(v) Name the fluid secreted by the part labelled ‘5’.
Answer:
(a) (1) 1—Stratum corneum, 2—Sensory corpuscle, 3-Sebaceous gland, 4—Erector muscle of hair
(ii) Function of part 3 : Sebaceous glands produce an oily secretion called sebum which makes hair, skin oily and water proof. It prevents loss of water by evaporation.
Function of part 4: Erector muscle contracts and pulls the hair causing goose flesh which we experience mainly during winter or in emotional conditions.
Function of part 6 : Hair follicle which helps in growth and elongation of hair.
(iii) Keratin
(iv) Melanin
(v) Sweat is secreted by sweat gland.

(b) Complete the following paragraph by filling in the blanks (i) to (x) with appropriate words : [5]
The hind limb consists of a long bone ……………. (i) in the thigh, two long bones, the inner ……………. (ii) and the outer ……………. (iii) in the shank, seven ……………. (iv) bones in the ankle, five long ……………. (v) bones in the middle of the foot and fourteen ……………. (vi) in the toes. The forelimb consists of a long bone ……………. (vii) in the upper arm and two long bones ……………. (viii) and ……………. (ix) in the lower arm. The wrists has eight bones called ……………. (x).
Answer:
(i) Femur
(ii) Tibia
(iii) Fibula
(iv) Tarsals
(y) Metatarsals
(vi) Phalanges
(vii) Humerus
(viii) Radius
(ix) Ulna
(x) Carpals

Question 3.
(a) Study the diagram given below and answer the questions that follow : [5]

(i) Identify the above structure and mention its location in a flower.
(ii) Lebel the parts numbered 1 and 2.
(iii) Explain the term ‘Double Fertilization’.
(iv) What is the fate of the calyx and corolla after fertilization ?
(v) Draw a neat, labelled diagram of a pollen grain.
Answer:
(a) (i) It is an ovule showing the embryo sac inside it. It is an inner part of ovary which is the part of female reproductive organ, pistil of the flower.
(ii) 1-Antipodal cells, 2-Polar nuclei
(iii) Double fertilization is the process in which one sperm nucleus fuses with egg cell nucleus to form embryo and other sperm nucleus fuses with two poiar nuclei to form primary endosperm.
(iv) After fertilization, calyx either fall off or remain intact either in dried form or shriveled form. Corolla also falls off.
(v)

(b) Give an example for each of the following : [5]
(i) A poriferan
(ii) An antibiotic
(iii) A coelenterate
(iv) A deficiency disease
(v) A mammal
(vi) An annelid worm
(vii) A reptilian
(viii) A fat soluble vitamin
(ix) An amphibian
(x) A protein deficiency disease.
Answer:
(i) Bath sponge
(ii) Streptomycin
(iii) Hydra
(iv) Marasmus
(y) Monkey
(vi) Leech
(vii) Snake
(viii) Vitamin A
(ix) Salamander
(x) Kwashiorkor

Question 4.
(a) Study the experimental set given below and answer the following questions [5]

(i) What is the aim of the experiment shown above ?
(ii) What is your observation after a few hours for flask A’ and ‘B’ ?
(iii) Name the chemical uged to prevent bacterial growth.
Explain how the bacteria would interfere with the experiment.
(iv) Why do we use thermos flasks specifically for the experiment ?
(v) Which is the control set-up and why ?
Answer:
(a) (i) To show that heat is liberated by respiration process from germinating seeds.

(ii) In flask A, as seeds are germinating so they undergo respiration and heat is evolved which is marked by rise in mercury level of thermometer. But in flask B as seeds are dead, so no respiration and thus no heat is produced. So mercury level in thermometer will not rise.

(iii) Carbolic acid : Bacteria will undergo respiration and will produce heat that will cause rise in level of mercury of thermometer. Thus, the bacterial growth may interfere with results of the experiment.

(iv) Thermos flask acts as an insulator, so it does not allow outside environmental temperature to interfere with the results of the experiment.

(v) Flask B is a control set-up as seeds are dead, so there is no respiration hence no production of heat.

(b) Fill in the blanks with suitable words :[5]

Answer:
1.Milk protein/casein
2. Paracasein
3. Maltose
4. Glucose
5. Fatty acids
7. Peptides
8. Amino acids
9. Proteins
10. Peptides

Question 5.
(a) Study the diagram given below and answer the questions that follow : [5]

(i) Name the structure shown in the diagram.
State in which part of small intestine, it is present.
(ii) How is this structure well-adapted for absorption of digested food ?
(iii) Label the parts numbered 1 and 2.
(iv) Name the lymph vessel present inside the structure.
(v) Name the digestive juice secreted by the liver.
What are the two pigments present in it ?
Answer:
(a) (i) It is a microscopic structure of intestinal villus. It is present in ileum part of small intestine.
(ii) Villi increases the inner surface area of intestine enormously which facilitates the absorption of digested food.
(iii) 1-Epithelium, 2-Capillaries
(iv) Lacteal
(v) Bile
Biliverdin and bilirubin are the two pigments present in bile.

(b) Give appropriate biological / technical terms for the following : [5]
(i) The mode of arrangement of flowers on the axis of the plant.
(ii) The type of waste generated in hospitals and pathological laboratories.
(iii) Different timings of maturation of androecium and gynoecium.
(iv) The process of formation of a seedling from the embryo.
(v) The energy currency of the cell.
(vi) The category of immunity required in the treatment of a snake bite.
(vii) The outermost covering of a vacuole.
(viii) The membrane that encloses the lungs.
(ix) The tissue which stores fat.
(x) The device used to remove gaseous and particulate air pollutants.
Answer:
(i) Inflorescence
(ii) Biomedical wastes
(iii) Dichogamy
(iv) Germination
(v) ATP
(vi) Artificially acquired passive immunity
(vii) Tonoplast
(viii) Pleura
(ix) Adipose tissue
(x) Scrubbers

Question 6.
(a) Study the diagram given below and answer the questions that follow : [5]

(i) Name the structure shown and label its parts 1 and 2.
(ii) Is the given structure albuminous or non-albuminous ?
Give reason for your answer.
(iii) Name the protective coverings of part labelled 3 and 4.
(iv) Name the protein-rich layer of endosperm.
(v) Why is the given structure called a grain ?
Answer:
(a) (i) It is a longitudinal section of a maize grain.
1-Endosperm, 2-Scutellum
(ii) It is albuminous as a large endosperm is present.
(iii) Protective covering of part 3 i.e., plumule is coleoptile and that of part 4 i.e., radicle is coleorhiza.
(iv) Aleurone layer
(v) Here, fruit wall and seed coat are fused together to form a protective layer, so we call

(b)
(i) Draw a neat and labelled diagram of a plant cell. [5]
(ii) Based on the diagram drawn above in
(i) give a suitable term for each of the following descriptions :
1. The site of protein synthesis.
2. A cell organelle that is absent in a plant cell.
3. The supporting framework of the cell.
4. The plastids that contain DNA and have the capacity to divide.
5. The structure that carries the hereditary units.
6. The cell organelle that regulates all the metabolic functions.
7. The structure that is semi-permeable in nature.
Answer:
(i)

(ii) 1. Ribosomes
2. Centrosome
3. Endoplasmic reticulum
4. Chloroplasts
5. Chromosomes
6. Nucleus
7. Cell membrane

Question 7.
(a) Given below are four living structures. Study the same and answer the questions given below: [5]

(i) Name the structure A, B, C and D.
(ii) State the living cells in the structure D.
(iii) Name the fluid in which the structure B is found.
(iv) What is the function of the structure C ?
(v) Draw a neat, labelled diagram of a Neuron.
Answer:
(a) (i) A-Parenchyma, B-WBC, C-Unstriated muscles, D-Bone.
(ii) Osteoblasts
(iii) Blood and lymph
(iv) Unstriated muscles helps in passage of food, contraction of uterus during childbirth, contraction and dilation of the pupil. They are involuntary in function.

(v)

(b) Answer the following questions briefly : [5]
(i) State two activities of the Red Cross.
(ii) State any two ways by which food can be preserved.
(iii) One should breathe through the nose and not through the mouth. Explain.
(iv) The wall of the trachea is supported by ‘C’ shaped cartilaginous rings. Give a suitable reason.
(v) State two activities of.WHO.
Answer:
(b) (i) Two activities of Red Cross are :
1. To arrange ambulance service in all emergencies.
2. To extend relief and help to victims of calamity like fire, flood, earthquake, famine etc.

(ii) Two ways of preserving food are :
1. Boiling or heating at high temperature.
2. By salting. Foods like pickles, fish, meat are preserved by this method.

(iii) Nostrils contain fine hairs which trap large foreign particles present in air and prevent them from entering into our body. Nasal chamber secretes mucous which entraps harmful particles like dust, germs thus allowing pure and germ free air entering into our respiratory tract. It also warms and moistens the air. Thus, we should breathe through nose and not through mouth.

(iv) The C-shaped cartilaginous rings provide strength and flexibility to the walls of trachea and keep the trachea in distended condition permanently without collapsing the windpipe.

(v) Two activities of WHO are :
1. To organize campaigns for control of epidemic and endemic diseases.
2. To promote and support projects for research on diseases.

ICSE Class 9 Biology Question Papers with Answers

ICSE Class 9 Biology Sample Question Paper 5 with Answers

Section -1
(Attempt all questions from this section)

Question 1.
(a) Name the following :
(i) The book in which Robert Hooke’s discovery about cell was published.
(ii) Smallest known cell.
(iii) The kind of tissue found as gritty masses in the skin of pears.
(iv) The large, colourful leaf-like structure in Bougainvillea.
(v) A distinct white oval scar mark on concave side of seed.
Answer:
(i) Micrographia
(ii) Mycoplasma
(iii) Scierenchyma
(iv) Bract
(v) Hilum

(b) Choose the correct answer from the options given below :
(i) The hierarchy of classification of various levels of diversity is :
(a) Kingdom, phylum, order, class, genus, family, species
(b) Phylum, order, class, kingdom, genus, species, family
(c) Order, kingdom, phylum, family, genus, species, class
(d) Kingdom, phylum, class, order, family, genus, species
Answer:
(d) Kingdom, phylum, class, order, family, genus, species

(ii) Which bacteria is rod-shaped ?
(a) Coccus
(b) Vibrio
(c) Bacillus
(d) Spirillum
Answer:
(c) Bacillus

(iii) The phylum in which largest number of animals are present is :
(a) Mollusca
(b) Annelida
(c) Arthropoda
(d) Echinodermata
Answer:
(c) Arthropoda

(iv) WHO was established in the year and headquarters are located in……………..
(a) 1864, Geneva
(b) 1948, Geneva
(c) 1948, Paris
(d) 1864, Denmark
Answer:
(b) 1948, Geneva

(v) A disease widely spread worldwide is known as :
(a) Endemic
(b) Epidemic
(c) Sporadic
(d) Pandemic
Answer:
(d) Pandemic

(c) Name the kingdom/phylum/class of the following organisms :
(i) Sycon
(ii) Mosses
(iii) Sea anemone
(iv) Millipedes
(v) Scorpions
Answer:
(i) Kingdom – Anirnalia, phylum – Ponfera, class – Calcarea
(ii) Kingdom – Plantae, phylum – Bryophyta, class – Bryopsida
(iii) Kingdom – Animalia, phylum – Cnidaria, class – Anthozoa
(iv) Kingdom – Animalia, phylum – Arthropoda, class – Myriapoda
(v) Kingdom – Animalia, phylum – Arthropoda, class – Arachnida

(d) Fill in the blanks :
(i) ……………. forms spindle fibres with asters.
(ii) …………….and ……………. are called tracheary elements of xylem.
(iii) The condition when pollen of a flower of another plant of the same species fall on stigma is called …………….
(iv) On the basis of endosperm, seeds are classified as ……………. and …………….
(v) ……………. was first genetically engineered product produced from bacteria E. coli.
Answer:
(i) Centrosomes
(ii) Tracheids and vessels
(iii) Allogamy
(iv) Albuminous and ex-albuminous seeds
(v) Hormone insulin

(e) Differentiate between the following based on instructions given in brackets.
(i) Vibrio cholerae and streptococcus (shape)
(ii) Azotobacter and rhizobium (where they are found)
(iii) Incisors and canines (number present in humans)
(iv) Assimilation and defaecation (definition)
(v) Cranium and vertebral column (number of bones present)
Answer:

(ii)	Azotobacter	Rhizobium
	Azotobacter is a free living bacteria present in the soil.	Rhizobium is a symbiotic bacteria present in the root nodules of leguminous plants.
(iii)	Incisors	Canines
	There are 8 incisors teeth in adult human being.	There are 4 canines teeth in adult human being.
(iv)	Assimilation	Defaecation
	Assimilation is the conversion of absorbed digested food into body material.	Defaecation is the expulsion of undigested remains of food from the alimentary canal.
(v)	Cranium	Vertebral column
	There are 8 bones in cranium or brain box.	There are 33 bones in the vertebral column.

(f) Statements given below are incorrect. Write the correct form of the statements by changing first or last word only.
(i) Complete loss of pigmentation of skin is known as vitiligo.
(ii) The winter sleep in case of frogs is known as aestivation.
(iii) Air that can be forcibly expelled out after normal expiration is called vital capacity.
(iv) Anaerobic respiration is also called oxybiotic respiration.
(v) Respiration is a physico-chemical process.
Answer:
(i) Complete loss of pigmentation of skin is known as albinism.
(ii) The winter sleep in case of frogs is known as hibernation.
(iii) Air that can be forcibly expelled out after normal expiration is called expiratory reserve volume.
(iv) Aerobic respiration is also called oxybiotic respiration.
(v) Burning is a physico-chemical process.

(g) Match the items given in column I with the most appropriate ones in column II and rewrite the correct matching pairs.

Column I	Column II
(i) Scutellum (ii) Exine (iii) Monadelphous stamens (iv) Lymph (v) Areolar tissue	(a)    China rose (b)   Maize grain (c)   Fluid connective tissue (d)   Connective tissue proper (e)   Glandular epithelium (f)  Pollen grain (g)   Protista

Answer:

Column I	Column II
(i) Scutellum (ii) Exine (iii) Monadelphous stamens (iv) Lymph (v) Areolar tissue	(b)  Maize grain (f) Pollen grain (a) China rose(c)  Fluid connective tissue (d) Connective tissue proper

(h) Study the diagram given below and answer the following questions :

(i) Identify the organism. Give its scientific name.
(ii) Name the phylum to which it belongs. Give some characteristic features of organisms belonging to the phylum named by you.
(iii) Label parts 1-4.
(iv) What is the function of part 2 ?
(v) Give the economic importance of this organism.
Answer:
(i) It is an Indian earthworm. Scientific name is Pheretimaposthuma.
(ii) It belongs to phylum Annelida. Some characteristic features of the organisms belonging to this phylum are :

• Their body is cylindrical and divided into ring-like segments.
• They have well- developed digestive system with alimentary canal open at mouth and anus.
• They have a true body cavity.

(iii) 1-Mouth, 2-Clitellum, 3-Body segment, 4-Anus.
(iv) Clitellum plays an important role in reproduction process.
(v) Some economic importance of this organism are :
1. They help in loosening and aeration of soil.
2. It increases the fertility of the soil by interchanging top layer of soil with inner layers.
3. It is used in vermiculture.
4. Its excreta is rich in nitrogenous matter which is an essential component for plant’s growth.

Section-II
(Attempt any four questions from this section)

Question 2.
(a) Give the exact location of the following :
(i) Adipose tissue
(ii) Cardiac muscles
(iii) Hypocotyl
(iv) Parotid glands
(v) Foramen magnum
Answer:
(i) Adipose tissue is a specialized fat storing tissues found under skin, around kidneys, eyeball etc.
(ii) Cardiac muscles are found in the walls of the heart.
(iii) Hypocotyl is the region of the axis below the cotyledons of seeds.
(iv) Parotid glands are located in front of and beneath each ear.
(v) Foramen magnum is a large hole on the back part of cranium.

(b) Study the figure given below and answer the following questions :

(i) Identify the structure. Label the parts 1-6.
(ii) What is the main difference between male and female skeleton ?
(iii) Name the bones present in hindlimbs with their number.
(iv) How many bones are present in pelvic girdle ?
(v) Give the two main divisions of skeleton.
Answer:
(i) It is the front portion of pelvis.
1—Acetabulum, 2—Ischium, 3—Pubis, 4—ilium, 5—Sacrum, 6-Coccyx.
(ii) Male skeleton is larger and heavier than female. The pelvis in female skeleton is wider and trough-shaped.
(iii) Femur—2, tibia-2, fibula—2, ta rsals—1 4, patella-2, metatarsals—10, phalanges—28. So there are total 60 bones in our hindlimbs.
(iv) Our pelvic girdle is made up of two hip bones. Each hip bone is made up of three bones— ilium, ischium, pubis.
(v) Axial skeleton which includes skull, vertebral Column, ribs, sternum and appendicuiar skeleton includes bones of Limbs and girdles.

Question 3.
(a) Give two points of differences between the following pairs :
(i) Kwashiorkor and Marasmus
(ii) Prokaryotes and Eukaryotes
(iii) Pisces and Amphibians
(iv) Flat worm and Roundworm
(v) Glycolysis and Kreb’s cycle
Answer:

(b) Study the below figure and answer the following questions :

(i) Identify the muscular tissue A, B and C.
(ii) Give some characteristic features of tissue A.
(iii) State the location of tissue B.
(iv) Give some characteristic features of tissue C.
(v) Give the location of tissue C.
Answer:
(i) A- cardiac muscles, B- skeletal or striated muscles, C- smooth or unstriated muscles.
(ii) They are involuntary in function. They are striated, uninucleated, short and branched muscles.
(iii) They are found in arms, legs, face, neck etc.
(iv) They are involuntary in function. They are spindle shaped/slender cells tapered at both ends. They are uninucleated.
(v) They are found in walls of intestine, urinary bladder, uterus, lining of blood vessels etc.

Question 4.
(a) Give reasons :
(i) Composting is a useful method contributing in crop farming.
(ii) Abnormally a large number of WBCs in the blood are usually an indication of some infection in our body.
(iii) Eating places should be free from flies.
(iv) We cannot hold our breath forcibly for a longer time.
(v) Food tube is partially collapsed when not in use
Answer:
(i) Composting is the process of putting biodegradable wastes in a compost pit to decay, so that by the action of microbes, it gets converted into manure which can be used in agricultural lands to grow crops or plants. So, composting is a very useful method contributing in crop farming.

(ii) When any foreign particles like disease-causing microbes enter into our body, WBCs immediately squeeze out of walls of blood capillaries and reach the site of infection and fight against the germs. Thus, abnormally a large number of WBCs in the blood are usually an indication of some infection in our body.

(iii) Flies are main carriers of germs as they sit on excreta which cause various diseases like cholera, typhoid, dysentery etc. If food will remain uncovered, the flies carrying these disease-causing germs will sit on our food, thus contaminating it and when we consume this contaminated food, we may suffer from various diseases. So, eating places should be free from flies.

(iv) The breathing process is involuntary i.e., not under the control of our will. To some extent we can increase or decrease the rate of breathing but after that we can not hold our breathe forcibly. Our respiratory centre is located in medulla oblongata which is stimulated by carbon dioxide concentration in our body. If we hold our breathe, carbon dioxide gas cannot be released to outside, so its concentration increases which will stimulate our respiratory centre.

(v) Food wall or oesophagus is soft so when there is no peristalsis process, it gets collapsed.

(b) Study the diagram given below and answer the following questions :

(i) Define the process shown in the figure above.
(ii) In which part of the alimentary canal does this process occurs ?
(iii) Is any enzyme secreted by the structure shown in above figure ? If yes, name it.
(iv) Sometimes reverse of the process named by you in Q. (i) occurs. Name the process and state why it occurs ?
(v) Name a structure which prevents backflow of food from :
1. Stomach to oesophagus.
2. Duodenum to stomach.
Answer:
Peristalsis is a wave of constriction caused by circular muscles of gut which pushes the food down into stomach.
It occurs in all regions of gut mainly in oesophagus.
No, oesophagus does not secrete any enzyme.
Antiperistalsis occurs when stomach is disturbed or overloaded where reverse wave of muscular contraction occurs causing throwing of food contents out from the mouth.
1. Cardiac sphincter
2. Pyloric sphincter.

Question 5.
(a) Define the following terms :
(i) Digestion
(ii) Sunstroke
(iii) Cellular respiration
(iv) Spawning of mushroom
(v) Bioweapons
Answer:
(i) Digestion is a process of conversion of complex food substances into smaller, simpler, diffusible molecules so that they can be absorbed and assimilated by our body.

(ii) Sunstroke is a condition in which sweat production is unable to keep pace with its evaporation in very hot winds, resulting in rise of body temperature which sometimes may prove fatal.

(iii) The complex chemical reactions which occurs inside a cell to release energy from glucose is called cellular respiration.

(iv) Spawning is the process of introduction of mushroom seed consisting of mycelium of selected type of mushroom into compost from which mushrooms will grow.

(v) Bioweapons are harmful biological agent like bacteria, virus, fungi which can cause diseases and may take epidemic shape killing living organisms. Example—Anthrax bacteria is used as bioweapons.

(b) Study the figure below and the answer the following questions :

(i) Identify the organelle.
(ii) Label its parts.
(iii) Name the important pigment present in this structure.
(iv) Name the other types of plastids. Describe them.

Question 6.
(a) Study the figure below and answer the following questions :

(i) Identify the figure.
(ii) Label the parts 1-10.
(iii) Whatdoyoumeanbytriplefusian?
(iv) Define double fertilization.
(v) What is the fate of following after fertilization:
1. Calyx
2. Integuments
3. Eggcell
4.Ovary
5.Ovule

(b) Give the alternative nana of the following vitamins:
(i) Vitamin A
(ii) Vitamin B₁₂
(ill) Vitamin C
(lv) Vitamin D
(y) VitaminK
(vi) VitaminE
(vil) Vitamin B₃
(viii) Vitamin B₅
(ix) Vitamin B₉
(x) Vitamin B₂

Question 7.
(a) Give any two characteristic features of the following:
(I) Mammals
(li) Moliusca
(iii) Gymnosperms
(iv) Thallophyta
(y) Fungi

(b) Study the figure below and answer de following questions:

(i) In how many flasks the different plant parts are kept in observation ?
(ii) What is the purpose of keeping a test tube containing lime water in each flask ?
(iii) In which test tubes will lime water turn milky ?
(iv) What is the purpose of set-up ?
(v) What conclusion do you draw from this experiment ?

ICSE Class 9 Biology Question Papers with Answers

ICSE Class 9 Biology Sample Question Paper 6 with Answers

Section -1
(Attempt all questions from this section)

Question 1.
(a) Name the following :
(i) An amoeboid cell in human body.
(ii) The condition in which filaments of stamens are united in several groups.
(iii) The category of plant tissues that have lost their ability to multiply.
(iv) Three cells inside embryo sac found near the micropylar end.
(v) The type of germination seen in maize grain.
Answer:
(i) WBCs
(ii) Polyadelphous
(iii) Permanent tissues
(iv) 1 egg cell, 2 synergids
(v) Hypogeal germination

(b) Choose the odd one out from the following terms given and name the category to which the others belong :
(i) Formalin, Bordeaux mixture, Lime, Mercurochrome.
(ii) Fly ash, Baggasse, Cow dung, Fertilizers.
(iii) Malaria, Sleeping sickness, Filariasis, Amoebic dysentery.
(iv) Cholera, Typhoid, Hepatitis, Dysentery, Tuberculosis.
(v) Acne, Pimples, Blackheads, Vitiligo.
Answer:

(i) Odd : Mercurochrome
Category : Disinfectants

(ii) Odd : Fly ash
Category : Agricultural wastes

(iii) Odd: Filariasis
Category : Diseases caused by protozoa

(iv) Odd : Tuberculosis
Category : Waterborne diseases

(v) Odd: Vitiligo
Category : Problems related to sebaceous glands.

(c) Fill in the blanks :
(i) Knee joint is protected by outer ……………..
(ii) The vibrations of …………….. in human beings produce sound.
(iii) …………….. is the largest gland of our body.
(iv) …………….. and …………….. are water soluble vitamins.
(v) …………….. is the most popular variety of mushroom grown in India.
Answer:
(i) Fibrous capsule
(ii) Vocal cords
(iii) Liver
(iv) Vitamin B, vitamin C
(v) Agaricus bisporous

(d) Choose the correct answer from each of the four options given below :
(i) The hardness of bone is due to:
(a) Calcium
(b) Magnesium
(c) Potassium
(d) Sodium
Answer:
(a) Calcium

(ii) An organelle which lacks a membrane is:
(a) Mitochondria
(b) Golgi complex
(c) Endoplasmic reticulum
(d) Ribosomes
Answer:
(d) Ribosomes

(iii) Which one of the following is a characteristic feature of an anemophilous flower?
(a) Pollen grains have specific gravity equal to that of water.
(b) Pollen grains are light, dry and smooth.
(c) Pollen grains are sticky.
(d) Flowers are large, brightly coloured and produce nectar.
Answer:
(b) Pollen grains are light, dry and smooth

(iv) Alcohol is produced during the process of :
(a) Oxybiotic respiration
(b) Combustion
(c) Fermentation
(d) Kreb’s cycle
Answer:
(c) Fermentation

(v) During respiration, there is :
(a) Gain in dry weight
(b) No change in weight
(c) Conversion of ADP to ATP
(d) Loss in dry weight
Answer:
(d) Loss in dry weight

(e) Given below are five sets of terms. In each case, arrange and rewrite each set so as to be in logical sequence :
(i) Axon endings, Dendrites, Axon, Synapse, Cyton, Nissl granules, Nodes of Ranvier.
(ii) Pollen tube, Stigma, Pollen grains, Anther, Embryo sac, Micropyle.
(iii) Sporangiophores, Spores, Mycelium, Sporangium, Substrate.
(iv) Food pipe, Duodenum, Buccal cavity, Ileum, Stomach, Rectum.
(v) Mandible, Sternum, Cranium, Phalanges, Patella, Pelvis, Acetabulum, Femur.
Answer:
(i) Dendrites, Cyton, Nissl granules, Axon, Nodes of Ranvier, Axon endings, Synapse.
(ii) Anther, Pollen grains, Stigma, Pollen tube, Micropyle, Embryo sac.
(iii) Spores, Substrate, Mycelium, Sporangiophores, Sporangium.
(iv) Buccal cavity, Food pipe, Stomach, Duodenum, Ileum, Rectum.
(v) Cranium, Mandible, Sternum, Pelvis, Acetabulum, Femur, Patella, Phalanges.

(f) Statements given below are incorrect. Write the correct form of statements in each case :
(i) Nitrosomonas convert nitrites into nitrates.
(ii) Bacteria reproduces by budding.
(iii) Reptiles have four chambered heart.
(iv) Annelids have an exoskeleton made up of chitin.
(v) Respiration is an anabolic process.
Answer:
(i) Nitrobacter convert nitrites into nitrates.
(ii) Bacteria reproduces by fission.
(iii) Reptiles have three chambered heart.
(iv) Arthropods have an exoskeleton made up of chitin.
(v) Respiration is a catabolic process.

(g) Give one important function of the following :
(i) Scrubbers
(ii) Diaphragm
(iii) Cerumen
(iv) Glenoid cavity
(v) Amylopsin
Answer:
(i) Scrubbers are devices which remove gaseous and particulate air pollutants.
(ii) Diaphragm separates thoracic cavity from abdominal cavity. The contraction and relaxation of diaphragm helps in breathing mechanism.
(iii) Cerumen is a wax-like substance which lubricates and protects the eardrum from germs and dust particles. It is secreted by ceruminous glands.
(iv) Pectoral girdle contains a cup-shaped cavity called glenoid cavity into which head of humerus fits.
(v) Amylopsin, also called pancreatic amylase, acts upon starch and converts it into maltose.

(h) Study the diagram given below and answer the following :

(i) Identify the figure.
(ii) What are true ribs and floating ribs ?
(iii) Label the parts indicated in diagram.
(iv) Name the cartilage and vertebrae present in this structure.
(v) What is the main function of this structure ?
Answer:
(i) It is rib cage or bony cage.
(ii) True ribs are attached to sternum in front with help of cartilage. They are seven pairs.
(iii) Floating ribs are not attached to the sternum and they are 11^th and 12^th pair of ribs. 1-Vertebral column, 2-Stemum, 3-Ribs, 4-Cartilage.
(iv) Hyaline cartilage and thoracic vertebrae are present.
(v) It protects our delicate organs like heart and lungs.

Section – II
(Attempt any four questions from this section)

Question 2.
(a) Answer the following briefly :
(i) Give few importance of nutrition.
(ii) Give major steps of mushroom cultivation.
(iii) Give two bacterial diseases in plants and animals each.
(iv) Give two rules in writing scientific names of living organisms.
(v) Give an equation representing :
1. Anaerobic respiration in yeast.
2. Anaerobic respiration in muscles.
Answer:
(i) Importance of nutrition :
1. It is required for growth as it builds up new cells.
2. It helps in repair of worn out or injured cells.
3. It provides energy to carry out various life processes.
4. It provides raw materials for synthesis of enzymes, hormones, milk, sweat etc.
5. It protects us from disease and infection.

(ii) The major steps of mushroom cultivation are :

1. Composting : Here, compost is prepared by using paddy or wheat straw, manure, fertilizer etc.
2. Spawning: Mycelium of selected type of mushroom is introduced into compost.
3. Casing : Soil is spread over compost.
4. Cropping and harvesting : Mycelium grows and tiny mushrooms are formed. When they are fully grown, they are taken out.
5. Preservation : They are preserved using various techniques.

(iii) Bacterial disease in plants are bacterial blight of cowpea, black rot of cauliflower. In animals, they are anthrax and tuberculosis.

(iv) Two rules in writing scientific names of living organisms are :

1. They are written in italics when in print and should be underlined when written in hand.
2. The first letter of genus should be capital letter and species should be small letter.

(v) C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂ + 2 ATP
C₆H₁₂O₆ → Lactic acid + 2 ATP + Heat/energy

(b) Study the figure below and answer the following questions :

(i) Identify the parts labelled in the figure.
(ii) Where does germination of pollen grains occur and how ?
(iii) What is the function of part 1 and 2 ?
(iv) How does the male nucleus reach the female gamete inside embryo sac ?
(v) Name the covering of pollen grain.
Answer:
(i) 1-Generative nucleus, 2-Tube nucleus.

(ii) Germination of pollen grains occurs on the stigma only if pollen grains have fallen on stigma of the same plant species. Stigma secretes some sugary substances which stimulates the germination of pollen grains.

(iii) Generative nucleus divides to form two male gamete nuclei/sperm nuclei. Tube nucleus directs the growth of pollen tube through style to reach the embryo sac present in ovary and then it disintegrates.

(iv) Pollen tube carrying two sperm nuclei and tube nucleus passes through the stigma and style by dissolving the tissues with the help of enzymes and finally reaches the ovule containing embryo sac. It pushes through micropyle and reaches the embryo sac containing female gamete.

(v) Pollen grain is covered with double layered wall-outer exine and inner intine.

Question 3.
(a) Differentiate between the following :
(i) Self pollination and Cross pollination
(ii) Androecium and Gynoecium
(iii) Epithelial tissue and Connective tissue
(iv) Monocots and Dicots
(v) Photosynthesis and Respiration
Answer:

(b) Study the figure below and answer the following questions :

(i) What does the experiment demonstrate ?
(ii) Why level of mercury in test tube B falls after few days ?
(iii) Wltich gas is liberated by this process and how can you prove its presence ?
(iv) What is a control in this experiment and why ?
Answer:
(i) It demonstrates anaerobic respiration in germinating seeds.
(ii) After few days, the mercury level falls off because due to anaerobic respiration carbon dioxide is produced which will occupy the space in the top of test tube and mercury level falls down.
(iii) Carbon dioxide gas is produced. If we will introduce KOH solution in test tube B, KOH will float on the surface of mercury which will absorb carbon dioxide gas and again mercury level will rise up in the test tube.
(iv) Test tube A is a control as boiled, sterilized seeds are taken which cannot undergo respiration either aerobically or anaerobically.

Question 4.
(a) Give reasons :
(i) Scientific names of living organisms are considered better than their common names.
(ii) Every living room in the house should get direct sunlight at least for a short time.
(iii) Tinned and sealed foods are not always safe to eat.
(iv) Protoplasm can not be analysed chemically.
(v) Maximum food is absorbed in ileum part of small intestine.
Answer:
(i) People from different countries with different languages use different names for a particular organism. So it creates confusion, hence to avoid any confusion it is better to assign a scientific name to living organisms than their common names.

(ii) Direct sunlight helps in killing the microbes like bacteria or fungi present in the room. Thus, it keeps the air inside room clean and pure, making healthy environment.

(iii) Sometimes in tinned and canned foods a special bacteria is found which causes severe food poisoning called botulism. Thus, they are not always safe to eat.

(iv) The chemical composition of protoplasm is very complex and as soon as it is removed from an organism, it ceases, so it cannot be analysed chemically.

(v) Ileum part of small intestine is very long and it provides more surface area for absorption of food. Villi which are finger-like projections in ileum are present numerously thus increase the surface area for absorption. Thus, maximum food is absorbed in ileum.

(b) Study the diagram given below and answer the following questions :

(i) Name the process shown in the diagram above.
(ii) Laber the parts 1-4.
(iii) What does the arrow 5 and 6 indicate ?
(iv) Name the corresponding structure found in plants.
(v) Give the percentage of oxygen and carbon dioxide present in inhaled and exhaled air.
Answer:
(i) Gaseous exchange in alveolus.
(ii) 1-Wall of alveolus, 2-RBC, 3-Wall of blood capillary, 4-Plasma
(iii) 5- Oxygen diffuses from alveoli to blood capillary.
6- Carbon dioxide diffuses out from blood capillary to alveoli.
(iv) Stomata through which exchange of gases occurs.
(v)

Gases	Inhaled air (%)	Exhaled air (%)
Oxygen	20.96	16.4
Carbon dioxide	0.04	4.0

Question 5.
(a) Complete the blanks in below figure :

Answer:
1. R.H. Whittaker
2. Monera
3. Plantae
4. Bryophyta
5. Pteridophyta
6. Monocots
7. Dicots
8. Vertebrates
9. Invertebrates
10. Eubacteria

(b) Study the figure given below and answer the following questions

(i) Name the accessory digestive glands shown in figure.
(ii) Name the secretion produced by part labelled 1 and its function.
(iii) Name the parts of structures labelled 2 and 3.
(iv) Identify the vestigial organ from the above figure and mention its exact location.
(v) Name the enzymes found in secretion secreted from gland labelled 4.
Answer:
(i) Liver, pancreas, salivary glands.
(ii) Part 1 is liver which produces bile and makes the medium of small intestine alkaline so that enzymes secreted by pancreas and small intestine can function properly. It also emulsifies fats so that fat digesting enzymes can act upon it properly.
(iii) Part 2 is small intestine which consists of duodenum, jejunum, ileum.
Part 3 is large intestine which consists of caecum, colon, rectum.
(iv) Vermiform appendix which is a worm-shaped tube arises from blind end of caecum.
(v) Enzymes present in part 4 i.e., pancreas are amylopsin, trypsin, steapsin.

Question 6.
(a) Give exact location of the following :
(i) Caecum
(ii) Submandibular glands
(iii) Bone marrow
(iv) Intervertebral disc
(v) Sebaceous glands
Answer:
(i) Caecum is a small blind pouch-like structure situated at the junction of small intestine and large intestine.
(ii) Submandibular glands lie close to the inner side of the lower jaw on each side.
(iii) Bone marrow is found in the cavity of long bones like femur, humerus etc.
(iv) Invertebral disc is a pad of cartilage between two vertebrae.
(v) Sebaceous glands are branched glands found in dermis region of skin and open into hair follicle and sometimes directly to outside.

(b) Study the below figure and answer the following questions :

(i) Name the organism.
(ii) Is it unicellular eukaryotic or multicellular eukaryotic organism ?
(iii) To which kingdom does it belongs ?
(iv) Give examples of some other organisms belonging to this category.
(v) Name the type of nutrition found in the organism shown in figure.
Answer:
(i) It is a chlamydomonas.
(ii) It is unicellular eukaryotic organism.
(iii) It belongs to kingdom Protista.
(iv) Euglena, paramecium, amoeba.
(v) Autotrophic nutrition.

Question 7.
(a) Complete the following paragraph by filling in the appropriate term.
Plant tissues are basically of two types ………….. (i) and ………….. (ii)…………… (iii) tissue is found in growing points of a plant. Permanent tissues are of three types ………….. (iv), ………….. (v) and ………….. (vi). Xylem and
phloem are examples of ………….. (vii) tissue ………….. (viii) ………….. (ix) and ………….. (x) are examples of supporting tissue.
Answer:
(i) Meristematic
(ii) Permanent
(iii) Meristematic
(iv) Protective
(y) Supporting
(vi) Conducting
(vii) Conducting
(viii) Parenchyma
(ix) Collenchyma
(x) Scierenchyma

(b) Study the figure given below and answer the following questions :

(i) Identify the cell. Give reason in support of your answer.
(ii) Name the only organelle present in animal cells. What is its role ?
(iii) What is the function of organelle labelled 1, 2 and 3 ?
(iv) How can you differentiate between prokaryotic cell and eukaryotic cell ?
(v) Draw a labelled diagram of a prokaryotic cell. Name the kingdom in which they are placed.
Answer:
(i) It is plant cell as it contains cell wall. chioroplast and a large, centrally placed vacuole.

(ii) Centrosome. It initiates and regulates cell division and forms spindle fibres with the help of asters.

(iii) Part 1 is ribosomes which help in protein synthesis.
Part 2 is golgi complex which secretes enzyme, hormones and forms acrosome of sperm.
Part 3 is vacuole which provides turgidity to cell and stores water, food, waste substances etc.

(iv)

Prokaryotic cell	Eukaryotic cell
1. In prokaryotic cell, nucleus is not well defined i.e., chromatin lies free in cytoplasm without nuclear membrane and nucleolus. 2. Cell organelles are absent.	In eukaryotic oil, nucleus is well-defined with nucleolus and nuclear membrane. 2. Various types of cell organelles are present.

(v) They are placed in kingdom Monera.

ICSE Class 9 Biology Question Papers with Answers

 

ICSE Class 9 Biology Sample Question Paper 10 with Answers

Section -1
(Attempt all questions from this section)

Question 1.
(a) Name the following :
(i) Membrane surrounding the vacuole.
(ii) The kind of animal tissue in which cells are flat, cuboidal or columnar forming protective layer.
(iii) A seed with folded plumule leaves.
(iv) The constituent of food which changes the colour of ammonium hydroxide first from white to yellow and then yellow to orange.
(v) The muscles which raise the weight of the body on the toes.
Answer:
(i) Tonoplast
(ii) Epithelial tissue
(iii) Bean seed
(iv) Protein
(v) Gastrocnemius muscle

(b) State whether the following statements are true or false. If false, rewrite the statements in the correct form :
(i) When a flower arises in the axil of a leaf-like structure, the structure is known as bract.
(ii) The presence of a hood covering the stigma is a condition of heterostyly in flowers.
(iii) Tegmen is the outermost layer of the seed.
(iv) The scientific name of house crow is Corvus macrorhynchos.
(v) Cataract is an example of degenerative disease.
Answer:
(i) True
(ii) False, The presence of a hood covering the stigma is a condition of herkogamy in flowers.
(iii) False, Testa is the outermost layer of the seed.
(iv) False, The scientific name of house crow is Corvus splendens.
(v) True

(c) Match the items of column I with those in column II and rewrite the correct matching pairs.

Column I	Column II
(i)  Blood clotting factor VIII (ii)  Viviparous germination (iii) Air spaces (iv) Bronchi (v) Steapsin	(a)   Emulsified fats (b)  Gray hair (c)   Haemophilia A (d)   Rhizophora (e)   Maize grain (f)  An inverted Y-shaped tube (g) Haemophilia B

Answer:

Column I	Column II
(i)  Blood clotting factor VUI (ii)  Viviparous germination (iii) Air spaces (iv) Bronchi (v) Steapsin	(c)  Haemophilia A (d) Rhizophora (b) Gray hair (f) An inverted Y-shaped tube (a) Emulsified fats

(d) Identify the odd term in each set and classify the rest under one category.
(i) Town area committees, Municipal Corporations, Municipalities, Red Cross.
(ii) BCG, DT, DPT, ATP.
(iii) Syphilis, Gonorrhea, Leprosy, Herpes.
(iv) Trachea, Bronchioles, Alveoli, Oesophagus.
(v) Scapula, Sternum, Vertebrae, Mandible.
Answer:
(i) Odd : Red cross
Category: Local bodies

(ii) Odd: ATP
Category : Names of vaccines

(iii) Odd: Leprosy
Category : Sexually transmitted diseases

(iv) Odd : Oesophagus
Category : Parts of respiratory tract

(v) Odd : Scapula
Category : Bones of axial skeleton

(e) Fill in the blanks :
(i) Joint between bones of wrist is an example of joint.
(ii) Liver produces only in embryo.
(iii) is popularly called fruit sugar.
(iv) is the lowest level in biological classification.
(v) is an example of bird pollinated flower.
Answer:
(i) Gliding
(ii) Red Blood Cells
(iii) Fructose
(iv) Species
(v) Canna

(f) Choose the correct answer from each of the four options given below :
(i) Features that help the bird to maintain constant body temperature is :
(a) Digits
(b) Wings
(c) Pneumatic bones
(d) Feathers
Answer:
(d) Feathers

(ii) Which of the following components of phloem is absent in monocot stem ?
(a) Sieve tubes
(b) Companion cells
(c) Phloem parenchyma
(d) Phloem fibres
Answer:
(c) Phloem parenchyma

(iii) Tissue found in area of regular wear and tear is :
(a) Simple squamous epithelium
(b) Stratified squamous epithelium
(c) Cuboidal epithelium
(d) Columnar epithelium
Answer:
(b) Stratified squamous epithelium

(iv) Which one of the following characteristics is found in all fungi but not in all bacteria ?
(a) Aerobic respiration
(b) Cell wall
(c) Spore formation
(d) A long circular DNA lying loose in the cytoplasm
Answer:
(c) Spore formation

(v) Which one of the following pairs of types of teeth performs one common function as stated against it ?
(a) Incisors, canines — Holding
(b) Canines, premolars — Tearing
(c) Premolars, molars — Grinding
(d) Molars, incisors — Tearing
Answer:
(c) Premolars, molars – Grinding

(g) Given below are five sets of terms. Rewrite the terms in correct order so as to be in a logical sequence beginning with the term that is underlined :
(i) Embryo, 1st male gamete, zygote, egg cell, micropvle.
(ii) Preservation, casing, composting, spawning, cropping and harvesting.
(iii) Pulp cavity, dentine, periodontal membrane, enamel.
(iv) Mandible, pelvis, cervical vertebrae, patella, acetabulum.
(v) Stamens, petals, epicalyx, sepals, pistils, receptacle, stalk.
Answer:
(i) 1st male gamete, micropyle, egg cell, zygote, embryo.
(ii) Composting, spawning, casing, cropping and harvesting, preservation.
(iii) Enamel, dentine, pulp cavity, periodontal membrane.
(iv) Mandible, cervical vertebrae, pelvis, acetabulum, patella.
(v) Stalk, receptacle, epicalyx, sepals, petals, stamens, pistils.

(h) Study the diagram given below and answer the following questions :

(i) It is a bony fish which belongs to class pisces, phylum chordata and kingdom Animalia.

(ii) They breathe by means of gills, have streamlined body covered with scales and have fins. They are cold blooded i.e., temperature of body directly fluctuates with temperature of environment.

(iii) They are mainly of two types :

• Cartilaginous fishes whose skeleton is made up of cartilage. Gill slits are exposed without gill cover. Examples-sharks, dogfish etc.
• Bony fishes whose skeleton is made up of bones. Gill slits are covered with operculum.

(iv) No, it is cold blooded animal.

Section – II
(Attempt any four questions from this section)

Question 2.
(a) Write two points of differences between the following pairs:
(î) Thallophyta and Bryophyta
(ii) Aerobic respiration and Anaerobic respiration
(iii) Bean seed and Maize grain
(iv) Entomophilous flowers and Anemophilous flowers
(v) Axial skeleton and Appendicular skeleton
Answer:

(b) Study the figure given below and answer the following questions:

(i) Identify the figure.
(ii) Label the parts as indicated in figure.
(iii) What are the cells of this structure known as and how are they arranged ?
(iv) What is the chemical composition of this structure ?
(v) What is the membrane of this structure known as ?
Answer:
(i) The figure shows an enlarged bone cell.
(ii) 1-Haversian canal, 2-Osteocyte, 3-Canaliculi.
(iii) The living cells are known as osteocytes and they are arranged in the form of concentric rings embedded in a ground matrix in which collagen fibres and mineral salts are deposited.
(iv) It consists of salts of calcium and phosphorus, collagen fibres.
(v) Periosteum

Question 3.
(a) Give the exact location of the following :
(i) Pylorus
(ii) Cambium
(iii) Centrosome
(iv) Transverse process
(v) Hair root
Answer:
(i) Opening of the stomach into intestine is pylorus.
(ii) Cambium is situated below the bark of the stem.
(iii) It is a region surrounding the centrioles located near nucleus.
(iv) They are thick sideward projections from the neural arches of a vertebrae.
(v) Hair root is the part of hair embedded within the dermis.

(b) With regards to respiratory system of human beings, answer the following :
(i) How will you prove that exhaled air contains water?
(ii) How is the respiratory passage kept free of dust particles?
(iii) Why is the percentage of oxygen content less and carbon dioxide content more in exhaled air?
(iv) How does diaphragm help in inhalation and exhalation ?
Answer:
(i) When we breathe gently upon a cold surface like glass, water droplets appear on the surface which proves that exhaled air contains water.

(ii) The hair present in the nostrils prevent dust and other large particles from entering the respiratory tract. The mucous secretion in nasal chambers entraps the harmful particles. In this way, respiratory passage is kept free of dust particles.

(iii) Oxygen which we breathe in is used up by tissues for oxidation of glucose to release energy in the form of ATP to carry out metabolic activities. So, the percentage of oxygen content in exhaled air [16.4%] is less as compared to inhaled air [20.96%]. Tissues release carbon dioxide due to oxidation of glucose which is released out through exhaled air [4.0%]. Hence, carbon dioxide concentration is more in exhaled air.

(iv) During inhalation diaphragm contracts and flattens, thus increases the chest cavity lengthwise. Pressure decreases inside lungs, drawing air inside. During exhalation, diaphragm is relaxed which moves towards base of lungs and becomes dome-shaped, thus reducing the volume of thoracic cavity and the air is forced out of the lungs.

Question 4.
(a) Define the following :
(i) Expiratory reserve volume
(ii) Prophylaxis
(iii) Deamination
(iv) Peristalsis
(v) Pollination
Answer:
(i) Air that can be forcibly expelled out after normal expiration is called expiratory reserve volume.

(ii) The practice of artificially introducing the germs or germ substance into the body for developing resistance to a particular disease is called prophylaxis.

(iii) The process of breaking of excess amino acids in the liver where nitrogen containing amino group is removed and converted to urea is called deamination.

(iv) Peristalsis is the wave of constrictions caused by circular muscles of gut by which the food, in the form of bolus, passes through all regions of gut.

(v) Pollination is the transfer of pollen grains from the anther to stigma of same flower or different flower in same plant or different plant of same species.

(b) Study the figure of a bone given below and answer the following :

(i) Identify the figure.
(ii) Label the parts indicated in diagram.
(iii) To which part of skeleton does this structure belongs to ?
(iv) What is the main function of this bone ?
(v) What is the main function of the glenoid cavity ?
Answer:
(i) Pectoral girdle
(ii) 1-Spine, 2-Humerus, 3-Scapula, 4-Clavicle.
(iii) Appendicular skeleton
(iv) It helps in articulation of humerus i.e., bone of forelimbs to axial skeleton.
(v) The outer apex has a large cup-shaped glenoid cavity into which fits the round head of humerus.

Question 5.
(a) Give the exact function of the following :
(i) Endoplasmic reticulum
(ii) Lymph
(iii) Proteins
(iv) Cement
(v) Muscle
Answer:
(i) It is a supportive framework for the cell. It synthesizes and transport proteins and fats.
(ii) Lymph mainly consists of WBCs which play an important role in immune response. It absorbs fats and fatty acids from digestive system.
(iii) Proteins provide chemical material for growth and repair of body cells and tissues. During time of emergency, they get oxidised to release energy.
(iv) Cement is a bone-like structure which covers and fixes the root in position.
(v) Muscle provides all movements in body, cover the skeletal framework and give shape to the body. It helps to maintain body posture while sitting, standing or walking.

(b) With reference to digestive system of our body, answer the following questions :
(i) Name the digestive gland present in mouth. State its function also.
(ii) Give two important functions of the secretion secreted by the gland named by you in Q.(i) above.
(iii) Draw a labelled diagram of a tooth with two roots.
(iv) Name the following parts of a tooth :
1. Exposed above the gum.
2. Soft connective tissue contained in the central space of the tooth.
3. Slight constriction between root and crown.
4. Hard substance making the covering of the tooth.
Answer:
(i) Salivary glands. It secretes saliva which plays an important role in digestion and has many other important functions.

(ii) Saliva contains an enzyme ptyalin which acts upon starch and converts into maltose. It moistens

(iii)

(iv) 1. Crown
2. Pulp
3. Neck
4. Enamel

Question 6.
(a) Answer the following questions briefly :
(i) List two methods of controlling houseflies.
(ii) Give two advantages of incineration process and also state two precautions that should be taken during this process.
(iii) Describe about the parts of a hair.
(iv) How is liver an important organ in our body ?
(v) Why is spore formation in bacteria not considered a form of reproduction ?
Answer:
(i) 1. Houseflies can be controlled by spraying DDT and insecticides in houses and breeding places.
2. Food should be kept covered and well protected from flies.

(ii) Two advantages of incineration process are :
1. The ash left over occupies much less landfill space.
2. Residual ash in the bottom can be used for recovery of some metals.
Two precautions that should be taken during incineration are :
1. It should be carried out at very high temperature.
2. Incinerators should be installed away from residential areas.

(iii) A hair consists of three parts :
1. Hair shaft, which projects from skin and extends slightly below the surface of epidermis.
2. Hair root, which is embedded within dermis.
3. Hair bulb, which is the lowest expanded part which contains hair papilla with capillary blood supply.

(iv) Liver performs major functions in our body like :
1. It controls blood sugar level by converting excess glucose into glycogen.
2. Deamination of amino acids occurs in liver.
3. It synthesizes foetal RBCs.
4. It detoxifies drugs, alcohol.
5. It destroys dead RBCs and produces heparin, an anti-coagulant.
So, it is considered an important organ in our body.

(v) During unfavourable conditions, the bacterial cell draws its content into a spherical mass surrounded by a thick and hard protective wall called spore. This is called resting stage to withstand unfavourable conditions. When favourable conditions meet, the wall of spore ruptures and protoplasm becomes active. So, it is not a method of reproduction rather a method of escaping unfavourable conditions.

(b) (i) Draw the female reproductive part of a flower and label :
1. The part which is sticky and receptor of pollen grains.
2. The part that transfers male gametes.
3. The part that contains the female gametes.
(ii) How do the pollen grains reach to the female reproductive part in a flower ?
(iii) Describe how male and female gametes unite in a flowering plant.
Answer:
(i)

(ii) Pollen grains reach the stigma of carpel through pollination process by various pollinating agents like wind, insects, water etc.

(iii) The process of mixing of male and female gametes to form a zygote is called fertilization. By pollination process, pollen grains gets deposited on stigma of carpel. Under suitable conditions, they germinate. A long pollen tube containing two male gametes arises and it passes through style to reach the ovary. The ovary contains ovule which has a embryo sac. Female gamete is present inside embryo sac. The pollen tube enters the ovule through micropyle and penetrates the embryo sac. One male gamete fuses with female gamete to produce zygote whereas the second male gamete fuses with polar nuclei to form endosperm. This process is called double fertilization.

Question 7.
(a) Give biological terms for the following :
(i) The kind of plant cells with thin walls and usually a single large vacuole.
(ii) A specialized shoot in which leaves are modified into floral structures.
(iii) A condition in which filaments of stamens are united in two bundles.
(iv) The condition in which pollen from the anthers of same flower cannot germinate on the stigma of the same flower.
(v) The condition of seed in which cotyledons are thin and membranous and endosperm persists.
(vi) The spherical bacteria when occur in clusters.
(vii) The entire mass of thread-like structure of Rhizopus.
(viii) The expulsion of undigested food from alimentary canal.
(ix) The point at which two separate bones meet.
(x) The narrowing of blood vessels when outside temperature is low.
Answer:
(i) Parenchyma
(ii) Flower
(iii) Diadelphous
(iv) Self sterility
(v) Albuminous seeds
(vi) Staphylococci
(vii) Mycelium
(viii) Defaecation
(ix) Joint
(x) Vasoconstriction

(b) Study the cell organelle given below and answer the questions that follow :

(i) Identify the cell organelle. Label the parts indicated in figure.
(ii) Give two important functions of this cell organelle.
(iii) What is the function of structure labelled 4, 5?
(iv) Which is the largest cell organelle ?
Answer:
(i) Nucleus.
1-Outer membrane, 2-Inner membrane, 3-Nucleoplasm, 4-Nucleolus, 5-Chromatin reticulum, 6-Nuclear pore.

(ii) 1. Nucleus regulates and coordinates various life processes of the cell.
2. It plays an important part in cell division.

(iii) Nucleolus produces ribosomes, participates in protein synthesis by forming and storing RNA.
Chromatin become thick and ribbon-like during cell division which are the carriers of genes that control hereditary characters.

(iv) Nucleus

ICSE Class 9 Biology Question Papers with Answers

ICSE Class 9 Biology Sample Question Paper 9 with Answers

Section -1
(Attempt all questions from this section)

Question 1.
(a) Name the following :
(i) A machine that separates suspended wastes using electric current.
(ii) The period between the entry of germs and appearance of first symptoms of a disease.
(iii) Cells that remove dust particles in the trachea.
(iv) Hereditary skin disease.
(v) Bone present in upper arm.
Answer:
(i) Electrostatic precipitator
(ii) Incubation period
(iii) Ciliated epithelial cells
(iv) Albinism
(v) Humerus

(b) Fill in the blanks :
(i) In hypogeal germination elongates faster.
(ii) In …………… pollination, there is a lot of wastage of pollen grains.
(iii) ……………solution can absorb oxygen present in air.
(iv) The only living component of xylem is ……………
(v) The matrix of bone contain salts of ……………
Answer:
(i) Epicotyl
(ii) Cross
(iii) Pyrogallol
(iv) Xylem parenchyma
(v) Calcium and phosphorus

(c) Choose the correct answer from each of the four options given below :
(i) World Health Day is celebrated on :
(a) April 7
(b) July 7
(c) December 22
(d) June 5
Answer:
(a) April 7

(ii) In which disease legs swell and resemble like that of an elephant ?
(a) Taeniasis
(b) Ascariasis
(c) Amoebiasis
(d) Filariasis
Answer:
(d) Filariasis

(iii) The sum of tidal volume, inspiratory reserve volume, expiratory reserve volume is :
(a) Total lung capacity
(b) Residual volume
(c) Vital capacity
(d) Inspiratory capacity
Answer:
(c) Vital capacity

(iv) Which of the enzymes converts proteins to amino acids ?
(a) Amylase
(b) Lipase
(c) Rennin
(d) Trypsin
Answer:
(d) Trypsin

(v) Which vitamin is synthesized by skin ?
(a) Vitamin D
(b) Vitamin B
(c) Vitamin A
(d) Vitamin C
Answer:
(c) Vitamin A

(d) Give the exact function of the following :
(i) Steapsin
(ii) Bacterial spores
(iii) Testa
(iv) Areolar tissue
(v) Pneumatophores
Answer:
(i) Steapsin is an enzyme found in pancreatic juice which converts emulsified fat into fatty acids and glycerol.
(ii) Bacterial spores can withstand unfavourable conditions like drought, heat etc. and can survive in these conditions. They can be carried by wind, water etc. and on getting favourable conditions, they germinate.
(iii) Testa protects the delicate inner parts of seed from injury and also from the attack of bacteria, fungi and insects.
(iv) Areolar tissue makes the skin elastic and helps the skin to withstand strain, holds organs in position, attaches epithelial tissue to other underlying tissues.
(v) Pneumatophores are aerial roots present mainly in mangrove plants which have pores for breathing.

(e) Choose the odd one out and categorise the rest under one group.
(i) Areolar tissue, Adipose tissue, Fibrous connective tissue, Lymph.
(ii) Parenchyma, Collenc’hyma, Sclerenchyma, Phloem.
(iii) Testa, Tegmen, Cotyledon, Aleurone layer.
(iv) Cycas, Fir, Pine, Ferns.
(v) Liver, Wind pipe, Voice box, Alveoli.
Answer:
(i) Odd : Lymph
Category : Connective tissue proper

(ii) Odd: Phloem
Category : Supporting tissue

(iii) Odd : Aleurone layer
Category : Found in bean seed

(iv) Odd : Ferns
Category: Gymnosperms

(v) Odd: Liver
Category : Parts of respiratory tract

(f) The statements given below are incorrect. Write the correct form of the statement by changing the underlined words only.
(i) Volvox is a fungi.
(ii) Lenticels are found on surface of leaves which help in gaseous exchange.
(iii) TAB vaccine contains living weakened bacteria.
(iv) Rickets is a condition in which cornea of our eyes gets dried.
(v) Amylopsin is present in intestinal juice which digests starch to maltose.
Answer:
(i) Volvox is a thallophyta.
(ii) Stomata are found on surface of leaves which help in gaseous exchange.
(iii) BCG vaccine contains living weakened bacteria.
(iv) Xerophthalmia is a condition in which cornea of our eyes gets tired.
(v) Amylopsin is present in pancreatic juice

(g) Complete the following paragraph by filling in the appropriate term :
The method of naming organisms is called …………. (i) and was introduced first by …………. (ii). The five kingdom classification was proposed by (iii). Kingdom Plantae is divided into …………. (iv), …………. (v), …………. (vi),…………. (vii), and …………. (viii). Kingdom animalia is divided into …………. (ix) and …………. (x).
Answer:
(i) Binomial nomenclature
(ii) Linnaeus
(iii) R.H. Whittaker
(iv) Thallophyta
(y) Bryophyta
(vi) Pterìdophyta
(vii) Gyrmnosperms
(viii) Angiosperms
(ix) Vertebrates
(x) Invertebrates

(h) Study the figure given below and answer the following questions :

(i) Identify the seed. Is it a monocotyledonous or dicotyledonous seed ?
(ii) Label the parts.
(iii) Give some examples of this category of seed.
(iv) What is the function of the part labelled 3, 4, 5.
(v) Discuss the two types of germination process.
Answer:
(i) It is a bean seed which is a dicotyledonous seed.
(ii) 1- Testa, 2- Tegmen, 3- Cotyledons, 4- Plumule, 5- Radicle, 6- Hypocotyl, 7- Epicotyl.
(iii) Examples of this type of seed are gram, pea etc.
(iv) Cotyledons store food for the embryo and also protects it.
Plumule is the future shoot and radicle is the future root.
The two types of germination are :
1. Hypogeal germination : Here, epicotyl elongates and cotyledons remain underground like in pea and gram.
2. Epigeal germination : Here, hypocotyl elongates and cotyledons are pushed above the ground like in castor, bean.

Section – II
(Attempt any four questions from this section)

Question 2.
(a) The apparatus given below is set up to demonstrate a particular process occurring in plants. Study the same and answer the following :

(i) Name the process. Give the overall balanced equation to represent the process.
(ii) What is the objective of the experiment ?
(iii) Why is soda lime placed in the tube ?
(iv) What change would you observe in lime water present in flask A and B ?
(v) Give one precaution to be taken in this experiment.
Answer:
(i) Respiration process is demonstrated in this experiment.
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + 38 ATP
(ii) The main objective of the experiment is to show that carbon dioxide is given out during respiration.
(iii) Soda lime absorbs carbon dioxide from the incoming air so that it does not interfere with the results of the experiment.
(iv) In flask A, lime water turns milky because on respiration by plants, carbon dioxide is produced. But in flask B, lime water does not turn milky as soda lime absorbs carbon dioxide from the incoming air.
(v) To prevent photosynthesis, the experimental set-up should be covered with a black cloth.

(b) Write two characteristic features of the following :
(i) Bacteria
(ii) Animal cell
(iii) Fungi
(iv) Aves
(v) Arthropods
Answer:
(i) Two characteristic features of bacteria are :
1. They are prokaryotes i.e., nuclear material lies free in cytoplasm without nuclear membrane and nucleolus.
2. Their cell wall is made up of peptidoglycan and sometimes a slimy protective layer is present outside the cell wall.

(ii) Two characteristic features of animal cell are :
1. Centrosome is present which initiates and regulates cell division.
2. Cell wall and plastids are absent.

(iii) Two characteristic features of fungi are :
1. They are made up of thread-like structures called hyphae.
2. They have,no chlorophyll and their body is not differentiated into roots, stem or leaves.

(iv) Two characteristic features of aves are :
1. Their forelimbs are modified into wings and they have feathers.
2. Their body is streamlined, lay eggs with calcareous shells.

(v) Two characteristic features of arthropods are :
1. Their exoskeleton is made up of chitin.
2. They have jointed limbs and their exoskeleton casts off and regrows which is known as moulting.

Question 3.
(a) Answer the following questions briefly :
(i) Give some advantages and disadvantages of cross pollination.
(ii) Give one speciality of striated muscles and cardiac muscles.
(iii) What is the name of plastid, pigment present in ripe tomato and petals of sunflower ?
(iv) Name the different structures found in epidermis and dermis of human skin respectively.
(v) What is the role of fats in our body ?
Answer:
(i) Some advantages of cross pollination are :
1. Offsprings are healthier.
2. Seeds produced are abundant and viable.
3. New varieties are produced.

Disadvantages of cross pollination :
1. Pollination is not always certain.
2. There is lot of wastage of pollen grains.
3. The process is uneconomical for the plant as flower has to be large, coloured, scented and have to produce nectar.

(ii) Striated muscles are voluntary muscles made up of long fibres which are nucleated and striated (light and dark bands run across the fibres). Cardiac muscles are involuntary and do not get tired soon. They are found only in the walls of heart.

(iii) Plastids found in ripe tomato are chromoplasts and pigment is carotene. Plastids found in petals of sunflower are chromoplasts and pigment is xanthophyll.

(iv) Epidermis is the outer thinner part of skin which consists of stratum comeum made up of protein keratin, granular layer and malpighian layer which actively divides to produce new cells. Pigment melanin which is responsible for skin colouration is found in malpighian layer. Dermis is inner thick layer which contains blood vessels, nerve fibres, hair follicles, sweat glands, sensory organs, sebaceous glands etc.

(v) Fats produce more energy than carbohydrates in our body. They are an important storage form of food. They serve as a solvent for fat soluble vitamins like A, D, E and K. Fat under skin acts as an insulating layer and keeps the body warm.

(b) Study the below figure and answer the following questions :

(i) Name the organism.
(ii) Name the disease caused by it in humans.
(iii) Give symptoms of this disease.
(iv) How is it caused and how the disease can be prevented ?
(v) Label the parts indicated in diagram.
Answer:
(i) The organism is Entamoeba histolytica.
(ii) It causes amoebic dysentery.
(iii) Symptoms are diarrhea with griping pain and discharge of mucus and sometimes blood in stools.
(iv) It is caused through contaminated food and water. This disease can be prevented by proper sanitation and protecting food from flies and dust.
(v) 1-Pseudopodium, 2-Nucleus, 3-Blood cell.

Question 4.
(a) Give reasons :
(i) Yeast is used in baking industry.
(ii) Seeds should not be planted deep in the soil.
(iii) Rest and exercise are required for healthy body.
(iv) Glottis is guarded by epiglottis.
(v) Vertebral column is curved.
Answer:
(i) Due to its property of fermentation, yeast is used in baking industry. It ferments glucose/starch of wheat flour to produce ethanol and carbon dioxide which causes rising of dough that gives the bread a light, spongy texture.

(ii) Seeds, if planted deep in the soil, cannot get sufficient amount of oxygen which is very necessary for germination process. Insufficient pushing force in the embryonic parts i.e.r hypocotyl or epicotyl to break through the upper layers of soil may lead to the failure of germination of seeds.

(iii) Rest in the form of sleep for about 6-7 hours daily is required for all our organs including brain. Physical exercise is also required which improves our blood circulation and makes us active. More amount of oxygen enters into our body by doing exercise regularly. It helps us to stay healthy and fit.

(iv) Glottis is guarded by epiglottis which is a muscular flap-like structure that prevents entry of food into our wind pipe during swallowing.

(v) Vertebral column is curved to maintain balance of body in erect position. It protects the column from breaking, absorbs pressure and shocks while walking, running etc.

(b) Answer the following questions related to human skeleton :
(i) Give some functions of skeleton in our body.
(ii) What constitute our skeleton ?
(iii) What is the classification of bones based on their shape ?
(iv) Give region-wise classification of bones and their number in humans.
(v) What is present in the cavity of long bones ? State its function also.
Answer:
Some functions of human skeleton in our body are :
1. It provides support to our body parts and gives definite shape.
2. It protects our delicate organs like brain [skull], heart and lungs [ribs], spinal cord [vertebral column] etc.
3. Blood cells are formed in marrow of long bones.
4. It is a storehouse of calcium and phosphorus.
5. Bones and muscles bring about movements in-our body.

(ii) Bones, cartilage and ligaments constitute our skeleton.

(iii) Based on their shape, bones are long, short, flat and irregular.

(iv) Axial skeleton-80 bones.
Skull : cranium-8 bones, face-14 bones
Vertebral column-33 : cervical-7, thoracic-12, lumbar-5, sacrum-1 (fused 5), coccyx-1, Ribs – 24, stemum-1.

Appendicular skeleton-126 bones
Pectoral girdle-4 (clavicle-2, scapula-2)
Humerus-2, radius ulna-4, Carpals-16, metacarpals-10, phalanges-28
Pelvic girdle-2, femur-2, tibia fibula-4, tarsals-14, meta tarsals-10, phalanges- 28, patella-2

(v) Bone marrow is present in the hollow cavity of long bones. Yellow marrow gives rise to white blood cells whereas red marrow produces red blood cells.

Question 5.
(a) Give differences between the following pairs based on guidelines given in brackets.
(i) Immovable joint and Partially movable joint (examples)
(ii) Left lung and Right lung (number of lobes present)
(iii) Liver and Pancreas (location)
(iv) Vitamin K and Vitamin D (functions)
(v) TB and Typhoid fever (causative agent)
Answer:

(b) Study the diagram given below and answer the following :

(i) What is the function of pleural fluid and trachea ?
(ii) Give the name of covering of lungs.
(iii) What are the positions of diaphragm at the time of inhalation and exhalation ?
(iv) Why should lining of alveoli be moist ?
(v) What is the significance of the structure of alveoli ?
Answer:
(i) Pleural fluid present between pleural membrane provides lubrication for free movement of expanding and contracting lungs. Trachea is the windpipe through which air moves in and out of the lungs.

(ii) Pleura is the covering of lungs which is double layered-outer parietal and inner visceral layer.

(iii) During inhalation, diaphragm contracts and flattens whereas during exhalation, diaphragm relaxes and moves towards the base of lungs and becomes dome-shaped.

(iv) For easy diffusion of respiratory gases, lining of alveoli should be moist.

(v) Alveoli provide large surface area for diffusion of gases. It is the structural and functional unit of lungs.

Question 6.
(a) The figure shows alimentary canal of man. Study the same and answer the following questions:

(i) What are the three parts of small intestine and large intestine ?
(ii) How is caecum different in man and rabbit ?
(iii) What is the fate of starch, proteins and fats ?
(iv) How are glucose and amino acids assimilated in our body ?
(v) What is the function of gall bladder ?
Answer:
(i) Three parts of small intestine are duodenum, jejunum, ileum. Parts of large intestine are caecum, colon, rectum.

(ii) Caecum is longer in rabbit than human beings. It contains bacteria which produce some enzymes that digest cellulose but in humans no cellulose digesting enzyme is present.

(iii) Starch is converted into glucose, proteins into amino acids and fats into fatty acids and glycerol.

(iv) Glucose is oxidized in the presence of oxygen to release energy in the form of ATP which is used to carry out various metabolic activities. Excess glucose is stored in the form of glycogen in liver. Amino acids are used to build proteins. Excess amino acids are broken down in liver by deamination process and are converted into urea which is excreted out. Some part is converted into glucose.

(v) Gall bladder stores bile secreted by liver.

(b) State the importance of following vitamins and minerals in our body :
(i) Iron
(ii) Sodium
(iii) Vitamin A
(iv) Riboflavin
(v) Iodine
Answer:
(i) It is an important component of haemoglobin.
(ii) It regulates acid-base equilibrium.
(iii) It is an important component of visual purple in retinal cells of eye.
(iv) It regulates oxidation of food.
(v) It is an important component of thyroxine hormone secreted by thyroid gland.

Question 7.
(a) Study the figure below and answer the following questions :

(i) Which major organ of the flower does fig. A represent ? What is the collective term for this organ ?
(ii) Label the parts indicated in the figure.
(iii) Are the contents inside part 4, male or female ? How does this content come out ?
(iv) There is a flower where we use terms like standard, wings, keel. Name the flower.
(v) What part of the flower do the names given in Q.
(iv) above refer to ?
Answer:
(i) It represents stamen, a male reproductive organ of the flower. Collectively, they are known as androecium.
(ii) 1- Filament, 2- Anther, 3- Pollen grains, 4- Pollen sacs.
(iii) Pollen grains carry male gametes so they represent male part of the flower. When pollen sacs get fully mature, they rupture to liberate pollen grains.
(iv) Sweat pea .
(v) Standard, wings, keel etc. are the petals of the flower.

(b) Write the advantages of the following in the flower to the plant concerned :
(i) Long and feathery stigma
(ii) Brightly coloured petals
(iii) Smooth and light pollen
(iv) Fragnant nectar
(v) Sticky pollen grains and stigma
Answer:
(i) Long and feathery stigma are present in anemophilous flowers which are pollinated by wind. They are long and feathery, hanging out of the flower so that they can easily trap the pollen grains carried away by the wind.

(ii) The entomophilous flowers which are pollinated by insects have brightly coloured petals that attract insects for pollination.

(iii) Pollen grains which are light, dry and smooth can be easily carried by wind and it is a special feature of wind pollinated flowers.

(iv) Flower emits sweet smelling nectar to attract insects and is a feature of anemophilous flower.

(v) In case of insect pollinated flowers, both stigma and pollen grains are sticky. Pollen grains are sticky so that they can easily stick to the body of insects and can be carried away. Stigma is sticky so that it can trap pollen grains easily from body of insects.

ICSE Class 9 Biology Question Papers with Answers

ICSE Class 9 Biology Sample Question Paper 7 with Answers

Section -1
(Attempt all questions from this section)

Question 1.
(a) Name the following :
(i) The longest animal cell.
(ii) Tissue found in husk of coconut.
(iii) Three germ killing secretions of our body.
(iv) Cavity in the body in which human lungs are located,
(v) Location of the heat regulating centre of the body.
Answer:
(i) Neuron
(ii) Scierenchyma
(iii) Saliva, sweat, tears
(iv) Thoracic cavity
(v) Hypothalamus

(b) Choose the correct answer from each of the four options given below :
(i) First living cells were observed by :
(a) Leeuwenhoek
(b) Robert Hooke
(c) Virchow
(d) Robert Brown
Answer:
(a) Leeuwenhock

(ii) Phylum Mollusca can be distinguished from other non-chordates by the presence of :
(a) Bilateral symmetry and exoskeleton
(b) Mantle and gills
(c) Shell and non-segmented body
(d) Mantle and non-segmented body
Answer:
(c) Shell and non-segmented body

(iii) Pinna is supported by :
(a) Bone
(b) Tendon
(c) Capsule
(d) Cartilage
Answer:
(d) Cortilage

(iv) Pylorus is an opening from :
(a) Oesophagus into stomach
(b) Mouth cavity into oesophagus
(c) Stomach into intestine
(d) Intestine into rectum
Answer:
(c) Stomach into intestine

(v) The vector that transmits filarial worm is :
(a) Anopheles mosquito
(b) Culex mosquito
(c) Housefly
(d) Entamoeba
Answer:
(b) Culex mosquito

(c) Fill in the blanks :
(i) …………. is the liquid waste that runs off into the drains from the house.
(ii) ………….parasite is responsible for plague.
(iii) Incomplete closure of ………… during swallowing causes cough.
(iv) Curdling of milk occurs by …………….
(v) Three inlets of oxygen gas for respiration in plants are ………….. and ………….
Answer:
(i) Sewage
(ii) Rat-flea
(iii) Epiglottis
(iv) Lactobacillus
(v) Stomata, lenticels, general surface of roots

(d) State whether the following statements are true or false. If false, rewrite the correct form of the statement:
(i) Food is stored in endosperm in the case of maize grain.
(ii) Removing of anthers in young flowers is called pollination.
(iii) Diadelphous stamen condition is seen in Bombax.
(iv) In Volvox, a thallus-like body is present.
(v) Aspergillus is called blue mould.
Answer:
(i) True
(ii) False, Removing of antheis in young flowers is called emasculation.
(iii) False, Polyadeiphous stamen condition is seen in Bombax.
(iv) True
(v) False, Aspergillus is called green mould.

(e) Choose the odd one and include the rest under one group.
(i) Mycelium, Sporangium, Hyphae, Capsule. ,
(ii) Salivary glands, Liver, Pancreas, Prostate gland.
(iii) Glenoid cavity, Scapula, Clavicle, Acetabulum.
(iv) Frog, Salamander, Alligator, Sea cucumber.
(v) Plasmid, Cell wall, Chloroplast, Dictyosome.
Answer:
(i) Odd: Capsule
Rest belong to Rhizopus/bread mould

(ii) Odd : Prostate gland
Rest are glands associated with digestive system.

(iii) Odd : Acetabulum
Rest are associated with pectoral girdle.

(iv) Odd : Sea cucumber
Rest are vertebrates.

(v) Odd : Plasmid
Rest are found in a plant cell.

(f) Match the items given in column I with the most appropriate ones in column II and rewrite the correct matching pairs :

Column I	Column II
(i)  Coccyx (ii)  Devil fish (iii) Scutellum (iv)  Hay fever (v)  Chloromycetin	(a) Mollusca (b) Allergy (c) Antibiotic (d) Vertebrae (e) Maize

Answer:

Column I	Column II
(i) Coccyx (ii) Devil fish (iii) Scutellum (iv) Hay fever (v) Chloromycetin	(d) Vertebrae (a) Mollusca (e) Maize (b) Allergy (c) Antibiotic

(g) Differentiate between the following on the basis of guidelines given in brackets :
(i) Toxin and Antitoxin (definition)
(ii) Scrubbers and Electrostatic precipitators (function)
(iii) Sleeping sickness and Filariasis (causal agent)
(iv) Hibernation and Aestivation (definition)
(v) Immovable joint and Partially movable joint (example)
Answer:

(h) Study the formula given below and answer the following which is related to dental formula :
i 3/4 c 0/0 pm 0/1 m 1/1
(i) State the total number of teeth present in the dentition.
(ii) Is the dentition of a carnivore or herbivore ? Give reason.
(iii) Name an animal possessing such dentition.
(iv) Give dental formula of an adult human being.
(v) Give dental formula of a human child.
Answer:
(i) Total number of teeth is 20.
(ii) It is of herbivore as no canine teeth are present.
(iii) Rabbit
(iv) i 2/2 c 1/1 pm 2/2 m 3/3
(v) 2/2 c 1/1 pm 0/O m 2/2

Section – II
(Attempt any four questions from this section)

Question 2.
(a) Study the figure given below and answer the following questions:

(i) Identify figure A, B and C.
(ii) Which of them has heavy deposition of lignin ?
(iii) Which of them provides mechanical strength and flexibility ?
(iv) Which of them is modified to store chloroplasts in leaves ?
(v) Which of them is commercially exploited to obtain linen and hemp ?
Answer:
(i) A-Sclerenchyma, B-Parenchyma, C-Collenchyma
(ii) Sclerenchyma
(iii) Collenchyma
(iv) Parenchyma
(v) Sclerenchyma

(b) Give reasons :
(i) Raw mango is green in colour while ripe one is yellow.
(ii) Plasma membrane is a semi-permeable membrane.
(iii) Anthers in anemophilous flowers are loosely attached.
(iv) Disposable needles must be used for injection.
(v) Anaerobic respiration is an incomplete break down of glucose.
Answer:
(i) Raw mango contains chlorophyll which is a green pigment but when mango ripens, chlorophyll disintegrates and xanthophyll, carotene takes their places. So green colour changes to yellow or orange-red colour.
(ii) Plasma membrane allows only certain substances to pass through it while it prevents entry of other substances. So, it is called a semi-permeable membrane.

(iii) In anemophilous flowers, pollination occurs through wind. So anthers containing pollen grains are loosely attached to filament so that they can easily be blown away by slight wind movement.

(iv) Injection needles if shared by more than one person may introduce the HIV virus from one individual to another. So to prevent the transmission of HIV, disposable needles are used for injection.

(v) In anaerobic respiration, glucose is not completely oxidized. In plants or yeast cells glucose, in the absence of oxygen or insufficient oxygen, forms ethanol and carbon dioxide. In animal cells it produces lactic acid. Thus, incomplete break down of glucose occurs because when glucose completely breaks down, it gives carbon dioxide and water.

Question 3.
(a) State the exact function of the following :
(i) Municipalities
(ii) Pleural fluid
(iii) Meibomian glands
(iv) Red bone marrow
(v) HCL in gastric juice
Answer:
(i) Municipalities look after sanitation, supply of safe drinking water, arrange vaccination programmes, keep statistical records of births and deaths.

(ii) Pleural fluid is found between outer and inner membrane of lungs which provides lubrication for free movement of expanding and contracting lungs.

(iii) The secretion of meibomian glands is oily which lubricates the margins of eyelids and prevents the overflow of tears.

(iv) Red bone marrow produces RBCs.

(v) HCL makes the medium of stomach acidic so that pepsin enzyme gets activated to digest proteins. It also kills the germs that may have entered along with our food.

(b) Study the diagram given below and answer the following questions :

(i) Label the parts 1-6.
(ii) Give examples of synovial joints.
(iii) How is this joint protected ?
(iv) What is the function of the part labelled 3 ?
(v) Give an example of pivot joint.
Answer:
(i) 1-Bone, 2-Cartilage, 3-Synovial fluid, 4—Synovial membrane, 5-Fibrous capsule, 6-Ligament.
(ii) Shoulder joint, knee joint.
(iii) It is well protected by an outer fibrous capsule and held in position by ligaments. Synovial fluid lubricates the point of contact between two bones so that friction is reduced and we can easily bend our knee or shoulder without any pain.
(iv) Joint between skull and upper end of axis vertebrae.

Question 4.
(a) State the exact location of the following :
(i) Duodenum
(ii) Plasmid
(iii) Notochord
(iv) Epicalyx
(v) Columnar epithelial tissue
Answer:
(i) It is upper part of small intestine next to stomach.
(ii) Plasmids are extra-chromosomal DNA found in cytoplasm of bacteria.
(iii) It is a rod-like structure present in the mid-dorsal axis of the body in few primitive forms of chordates.
(iv) It is second series of sepals, lies outer to calyx in some flower like Hibiscus.
(v) They are tall like brick or cylindrical cells found in inner lining of stomach and intestine.

(b) Study the diagram given below and answer the following questions

(i) Identify figure A and B.
(ii) Label the parts 1-4.
(iii) What is the role of part 3 ?
(iv) Give the importance of cell organelle A and B.
(v) What is the special name of the organelle in figure B in plant cells ?
Answer:
(i) A is mitochondria, B is golgi complex
(ii) 1-Outer membrane, 2-Inner membrane, 3-Cristae, 4-Matrix.
(iii) Cristae provide a large amount of surface area for chemical reactions to occur as mitochondria is the site of aerobic respiration.
(iv) Mitochondria is the site of cellular aerobic respiration and stores energy in the form of ATP. It also synthesizes respiratory enzymes.
Golgi body synthesizes and secretes enzymes and hormones. It forms the acrosome of sperm.
(v) Dictyosomes

Question 5.
(a) Answer the following questions briefly :
(i) What is the function of ciliated epithelium and where is it found ?
(ii) Give advantages of long and feathery stigma in flowers.
(iii) Potatoes kept in basket during rainy season give out small shoots. Would you call it as germination ?
(iv) What special precaution would one take to conduct experiment on respiration process in green plants ?
(v) What are two forms of dysentery and their causal agent ?
Answer:
(i) The cells of ciliated epithelium have fine hair-like projections called cilia which constantly moves removing dust, foreign particles etc., from that region where it is present. It is found in the lining of trachea.

(ii) Long and feathery stigma is present in anemophilous flowers i.e., where pollination is done by wind. This type of stigma can easily trap pollen grains carried by wind.

(iii) No, it is called sprouting where small shoots arise from eye buds of potato tuber. But in case of germination, tiny shoots arise from seeds of plants.

(iv) We should not keep the experimental set-up containing the green plant under sunlight as carbon dioxide released will be used by plants for photosynthesis. So we should conduct respiration experiment in a dark room.

(v) Two forms of dysentery are :
1. Bacillary dysentery, caused by bacterium Shigella.
2. Amoebic dysentery, caused by protozoa Entamoeba histolytica.

(b) The figure below shows a section of a flower. Study it carefully and answer the following questions:

(i) Label the parts as indicated in figure.
(ii) Is it a perfect or imperfect flower ? Give reason.
(iii) What are esseritial and non-essential parts of a flower ?
(iv) Which are the male and female parts of a flower ?
(v) Give the collective term of the parts labelled 4,10, 3.
Answer:
(i) 1-Anther, 2-Filament, 3-Petal, 4-Sepal, 5-Receptacle, 6-Stalk, 7-Stigma, 8-Style, 9-Ovary, 10-Stamen.
(ii) It is a perfect flower as it contains all the four floral structures.
(iii) Essential parts of a flower are those that are directly concerned with reproduction e.g. stamens and carpels. Non-essential parts are those which protect the reproductive parts or helps the flower in pollination e.g. sepals and petals.
(iv) Male part is stamen which contains male gametes in pollen grains and female part is pistil which contains female gametes.
(v) Collective term for sepals is called calyx.
Collective term for stamens is called androecium.
Collective term for petals is called corolla.

Question 6.
(a) Give biological terms for the following :
(i) The process by which the cells are modified to perform specific function resulting in division of labour.
(ii) The condition in which sepals are fused in a flower.
(iii) The condition in which petals and sepals are undifferentiated together.
(iv) The type of germination seen in a bean seed.
(v) A common phase in both aerobic and anaerobic respiration.
(vi) A group of related families.
(vii) The technique of partial sterilization usually applied to milk.
(viii) A structure which prevents back flow of food from stomach into oesophagus.
(ix) The point at which two separate bones meet.
(x) The process of lifting of body hairs during emotions or winter season.
Answer:
(i) Differentiation
(ii) Gamosepalous
(iii) Perianth
(iv) Epigeat germination
(y) Glycolysis
(vi) Order
(vii) Pasteurization
(viii) Cardiac sphincter
(ix) Joint
(x) Piloerection

(b) Given below are five chemical reactions involving glucose and five different chemical products ( A-E ).

Write the reaction number for the following :
(i) Anaerobic respiration in plants
(ii) End products in aerobic respiration
(iii) Reactions occurring in liver
(iv) Anaerobic respiration in animals
(v) Storage in the liver
(vi) Aerobic respiration
(vii) Anaerobic respiration in yeast
(viii) Change taking place in potato
(ix) Fermentation
(x) During strenuous exercise in muscles
Answer:
(i) Reaction 5
(ii) Reaction 4
(iii) Reaction 3
(iv) Reaction 1
(v) Reaction 3
(vi) Reaction 4
(vii) Reaction 5
(ix) Reaction 5
(x) Reaction 1

Question 7.
(a) Give the treatment of the following diseases :
(i) Malaria
(ii) Sleeping sickness
(iii) Amoebic dysentery
(iv) Tuberculosis
(v) Typhoid
Answer:
(i) Drugs like quinine, paludrine, camoquin are used to treat malaria.
(ii) Drugs like melarsophol is used to treat sleeping sickness.
(iii) It can be treated with antibiotics. Proper sanitation, keeping food away from dust and flies.
(iv) Antibiotic streptomycin is used to treat TB and BCG vaccine helps in developing immunity against TB.
(v) Chloromycetin antibiotic is used to treat typhoid.

(b) Answer the following questions related to human skin :
(i) What are the two layers of human skin ?
(ii) Name some special derivatives of human skin.
(iii) Name the parts of a hair. Which part helps in growth and elongation of hair ?
(iv) Give the parts of a nail.
(v) Name the secretion of sweat gland. State its composition also.
Answer:
(i) The two layers of human skin are epidermis and dermis.
(ii) Some special derivatives of human skin are hair, nails, mammary glands, sweat glands, sebaceous glands.
(iii) Hair consist of three parts-hair shaft, hair root and hair bulb.
Hair bulb and hair follicle together are responsible for the growth and elongation of hair.
(iv) Plate, bed and matrix are the parts of a nail.
(v) Sweat is a secretion of sweat gland. It consists of about 99% water, 0.2-0.5% salts and traces of urea (0.08%).

ICSE Class 9 Biology Question Papers with Answers

ICSE Class 9 Biology Sample Question Paper 8 with Answers

Section -1
(Attempt all questions from this section)

Question 1.
(a) Name the following :
(i) The organs of defense in coelenterates.
(ii) Aerial roots present in plants like mangroves which help in breathing.
(iii) Mosquito which spread yellow fever.
(iv) Fish which eats larvae of mosquito.
(v) Alternative name of lockjaw disease.
(b) Give one example for the following :
(i) Cells in our body which undergo phagocytosis
(ii) A sporadic disease
(iii) Disease caused by parasitic worms
(iv) Useful fungi
(v) Bryophyta
Answer:
(i) Stinging cells
(ii) Pneumatophores
(iii) Aedes aegypti
(iv) Gambusia
(v) Tetanus

(b) Choose the correct answer from each of the four options given below :
(i) Which one of the following is made of dead cells ?
(a) Sclerenchyma
(b) Tracheids
(c) Vessels
(d) All of these
Answer:
(i) WBCs

(ii) The symbiotic association of algae and fungi is found in :
(a) Lichens
(b) Mosses
(c) Liverworts
(d) Ferns
Answer:
(ii) Malaria

(iii) Hollow bones are found in :
(a) Snake
(b) Frogs
(c) Fishes
(d) Birds
Answer:
(iii) Taeniasis

(iv) The inner lining of stomach is protected by one of the following from the harmful effect of hydrochloric acid which is :
(a) Bile
(b) Mucus
(c) Saliva
(d) Lipase
Answer:
(iv) Penicillium notatum

(v) World Rabies Day is celebrated on :
(a) September 8
(b) December 1
(c) June 5
(d) March 22
Answer:
(v) Mosses

(d) Complete the following statements by choosing the correct alternatives out of those given within brackets :
(i) The flower of papaya is ………….. (perfect / imperfect/ complete)
(ii) The solid material obtained by secondary treatment of waste matter is which is used as manure,………….. (effluent /sewage / sludge)
(iii) The causative agent of chicken pox is ………….. ( varicella zoster / taenia solium/ trypanosoma)
(iv) The total lung capacity in human beings is ………….. (6000 ml/4500 ml/ 3000 ml)
(v) ………….. is one of the problem associated with sebaceous gland due to hormonal influence. ( acne/ pimples/ blackhead)
Answer:
(i) Imperfect
(ii) Sludge
(iii) Varicella Zoster
(iv) 6000 ml
(v) Acne

(e) Statements given below are incorrect. Write the correct form of the statements by changing the underlined word only :
(i) Liver is the second largest gland in our body.
(ii) Deficiency of folic acid causes scurvy.
(iii) Flame cells are excretory organs of earthworm.
(iv) Anaerobic respiration in yeast is called pasteurization.
(v) Micropyle represents the spot where ovule was attached to ovarian wall.
Answer:
(i) Pancreas is the second largest gland in our body.
(ii) Deficiency of foilic acid causes anaemia.
(iii) Flame cells are excetory organs of tapeworms.
(iv) Anaerobic respiration in yeast is called fermentation.
(v) Hilum represents the spot where ovule was attached to ovarian wall.

(f) Choose the odd one out and categorise the rest under one group.
(i) Squamous, Columnar, Glandular, Ligament.
(ii) Stigma, Style, Filament, Ovary.
(iii) Synergid, Generative nucleus, Antipodal cell, Polar nuclei.
(iv) Jellyfish, Starfish, Brittle-star, Sea cucumber.
(v) Rickets, Xerophthalmia, Pellagra, Marasmus.
Answer:
(i) Odd : Ligament
Category : Epitheial tissue.

(ii) Odd : Filament
Category: Parts of carpel/pistil.

(iii) Odd : Generative nucleus
Category: Found inside ovule.

(iv) Odd : Jellyfish
Category: Echinoderms.

(v) Odd : Marasmus
Category: Vitamin deficiency diseases.

(g) Define the following :
(i) Antibiotic
(ii) Innate immunity
(iii) Basal metabolic rate
(iv) Malnutrition
(v) Species
Answer:
(i) Antibiotic is a chemical substance produced by microbes which can kill or inhibit the growth of other microbes.

(ii) Innate immunity is the immunity by virtue of genetic constitutional makeup which is present naturally in our body without any external stimulation or a previous infection.

(iii) The rate at which the body uses energy, while at rest, to maintain vital functions such as breathing is called basal metabolic rate.

(iv) Malnutrition is the condition in which a person suffers due to lack or deficiency of one or more essential elements of food.

(v) Species means an organism of particular kind whose members can interbreed among themselves to produce fertile young ones.

(h) Complete the following analogy
(i) Aerobic respiration : 38 ATP :: Anaerobic respiration : ……………………..
(ii) Radicle : Coleorhiza :: Plumule : ……………………..
(iii) Heterostyle : Primrose :: …………………….. : Pansy flower
(iv) Bract : Bougainvillea :: …………………….. : Nectaries
(v) Red bone marrow : RBCs :: Yellow bone marrow : ……………………..
Answer:
(i) 2 ATP
(ii) Coleoptile
(iii) Herkogamy
(iv) Nasturtium
(y) WBCs

Section – II
(Attempt any four questions from this section)

Question 2.
(a) Give two parts of differences between the following pairs :
(i) Plant cell and Animal cell
(ii) Poriferans and Cnidarians
(iii) Gastric juice and Intestinal juice
(iv) Bone and Muscle
(v) Sebaceous gland and Sweat gland
Answer:

(b) Study the figure given below and answer the following questions :

(i) Identify the virus. Name the infection it causes.
(ii) Give the symptoms of the disease.
(iii) How is this disease transmitted ?
(iv) Label the parts indicated in figure.
(v) When this disease was first recognized ?
Answer:
(i) It is HIV virus. It causes AIDS.
(ii) Symptoms are swollen lymph nodes, fever, night sweats, weight loss.
(iii) The disease is transmitted by sexual contact with infected person, contaminated blood transfusion, mother to child during pregnancy, shared injection needles.
(iv) 1-Viral protein, 2-Protein covering, 3-RNA.
(v) AIDS was first recognized in USA in 1981.

Question 3.
(a) Answer the following questions briefly :
(i) Give some merits of local defense system.
(ii) Under what conditions would the breathing rate increase ?
(iii) What is roughage ?
(iv) Describe the three types of lever mechanisms in our body.
(v) State the function of Meissner’s corpuscle and Pacinian corpuscle in the skin.
Answer:
(i) Some merits of local defense system are :
1. They start working instantaneously and are not dependent on previous exposure to infections.

2. They are effective against a wide range of potentially infectious agents. Breathing rate increases during strenuous physical exercise like running, swimming, brisk walking, emergency situation like fear, nervousness. The amount of oxygen in the body tissues decreases and concentration of carbon dioxide increases, thus breathing rate increases to attain the normal level of oxygen and carbon dioxide concentration.

Roughage is the cellulose part of fruits, raw vegetables and other plant materials that we consume. It is not digested in alimentary canal as our body does not secrete cellulose digesting enzymes.

The three types of lever mechanisms found in our body are :
1. Lever of first order : Here, fulcrum lies in between power and weight.
Example : Extension of arm at the elbow by action of triceps muscles.

2. Lever of second order : Here, weight is in between fulcrum and power.
Example : Muscles of leg [gastrocnemius muscle] raising weight of the body on toes.

3. Lever of third order : Here, power is in between fulcrum and weight.
Example : Biceps muscles flexing the arm.

(v) Meissner’s corpuscles detect the sense of touch whereas pacinian corpuscle detects the sense of pressure.

(b) The figure below shows the vertebral column. Study the same and answer the following questions:

(i) Give the main function of vertebral column.
(ii) Name the bones labelled 1-5 in the figure.
(iii) Draw a labelled diagram of thoracic vertebrae.
(iv) Describe the structure of a vertebrae.
Answer:
Vertebral column protects the spinal cord, maintains balance of the body in an erect position, provides attachment of pectoral and pelvic girdles, muscles. It forms the main axis of our body and has roles in both posture and movement.

(ii) 1. Cervical , 2.Thoracic , 3. Lumbar 4. Sacrum, 5. Coccyx.

(iii)

(iv) Vertebrae is a ring-like structure and its lower part is formed of a solid cylinder of bone called centrum. On back side of centrum is neural canal formed by union of two neural arches. Spinal cord runs through neural canal. Intervertebral disc forms a kind of cushion between two vertebrae. Neural spine is a ridge which projects upwards from the point where two neural arches meet. Transverse processes are thick projections from sidewards of neural arches. Neural arches bear articular facets which helps in joining two vertebrae.

Question 4.
(a) State the exact function of the following :
(i) Stratum corneum
(ii) Matrix of nail
(iii) Canines
(iv) Osculum
(v) Stigma
Answer:

• Stratum comeum is a tough layer which protects from mechanical damage, bacterial infection and loss of water by evaporation.
• Matrix of nail produces new cells and pushes out the older cells towards tip of nail thus causing growth of nail.
• Canines are conical and sharply pointed teeth which hold and tear the food.
• Osculum is a single, large opening on the top of sycon which is a Poriferan for exit of water.
• Stigma is the tip part of carpel which receives the pollen grains during pollination and the germination of pollen grains takes place on stigma.

(b) Study the figure below and answer the following questions :

(i) What does the figure represent ?
(ii) How does nerve impulse travel from one nerve cell to other ?
(iii) What is the main function of this structure ?
(iv) Describe the pathway in which nerve impulse travels through this structure.
(v) What is the outer covering of axon known as ?
Answer:
(i) Neuron/nerve cell.
(ii) The axon terminals in their swollen tip secrete a chemical called acetylcholine which is a neurotransmitter. It induces an electrical impulse on the dendrites of adjacent neuron, thus electrical impulse travels from axonal terminals of one neuron to dendrites of next neuron through synapse.
(iii) Neuron conducts nerve impulses from central nervous system i.e., brain and spinal cord etc. to distant places in our body.
(iv) Dendrites → Cyton/cell body → Axon → Axonal terminals.
(v) Neurolemma. In some neurons, myelin sheath is present called myelinated neurons which acts as an insulating layer.

Question 5.
(a) Give two characteristic features of the following :
(i) Angiosperms
(ii) Pteridophytes
(iii) Amphibia
(iv) Cnidaria
(v) Nematoda
Answer:
(i) 1. They have highly developed plant body with roots, stem, leaves, flowers, fruits.
2. Seeds are enclosed within fruits.

(ii) 1. They are non-flowering plants with root, stem and leaves.
2. Leaves are made of leaflets bearing spores on the underside.

(iii) 1. Amphibians live partly on land and partly in water.
2. They have three chambered heart, cold-blooded, adults breathe by means of lungs while larvae by gills.

(iv) 1. They have tentacles to catch food.
2. They have hard skeleton made up of calcium carbonate.

(v) 1. They are mostly parasitic and are long, cylindrical, unsegmented with false body cavity.
2. Alimentary canal is open at both ends i.e., mouth and anus.

(b) The figure below shows a cell. Study the figure and answer the following :

(i) Identify the cell. Is it a prokaryotic or eukaryotic cell ?
(ii) Label the parts indicated in figure.
(iii) What are the locomotory organelles present in the cell ?
(iv) What is the part labelled 2 made up of ?
(v) How does this cell obtain its nourishment ?
Answer:
(i) It is a bacterial cell. It is a prokaryotic cell.
(ii) 1-Capsule, 2-Cell wall, 3-Cell membrane, 4-Cytoplasm, 5-Mesosome, 6-Pilli, 7-Bacterial chromosome, 8-Plasmid, 9-Glycogen granules, 10-Flagellum.
(iii) Flagellum is the locomotory organelle. Lashing movement of flagellum provides locomotion of bacteria in a liquid environment.
(iv) Cell wall of bacteria is made up of peptidoglycan.
(v) Bacteria shows heterotrophic mode of nutrition. It may be saprotrophic i.e., draws nourishment from decaying dead organisms or parasitic i.e., draws nourishment from body of living hosts.

Question 6.
(a) Write the disease caused due to the following deficiencies :
(i) Vitamin K
(ii) Vitamin D
(iii) Fluorine
(iv) Calcium
(v) Chlorine
Answer:
(i) Haemorrhage
(ii) Rickets in children, osteomalacia in adults
(iii) Dental decay
(iv) Rickets, poor skeletal growth
(v) Muscular cramps

(b) Study the figure below and answer the following questions :

(i) Name the ducts which arises from structure labelled 1, 2 and 3.
(ii) Name the region to which gland labelled 1 and 2 pour their secretions.
(iii) How are the enzymatic reactions different in stomach and small intestine ?
(iv) Name the region in alimentary canal where :
1. Protein digestion starts
2. Carbohydrate digestion starts
Answer:
(i) Hepatic duct arises from part 1 i.e., liver.
Pancreatic duct arises from part 2 i.e., pancreas.
Cystic duct arises from part 3 i.e., gall bladder.

(ii) Duodenum region of small intestine

(iii) In stomach due to HC1 produced by gastric glands, the medium is acidic which activates the enzyme pepsin found in gastric juice. Pepsin acts upon proteins to form peptides. But in small intestine, bile which is secreted by liver, makes the medium alkaline so that enzymes secreted by pancreas and small intestine get activated and can act upon food substrates.

(iv) 1. Protein digestion starts first in stomach.
2. Carbohydrate digestion starts first in mouth.

Question 7.
(a) Name the phylum of the following :
(i) Mussel
(ii) Grasshopper
(iii) Beetle
(iv) Nereis
(v) Bath sponge
(vi) Skates
(vii) Duck-billed platypus
(viii) Heron
(ix) Sea urchin
(x) Hookworm
Answer:
(i) Mollusca
(ii) Arthropoda
(iii) Arthropoda
(iv) Annelida
(v) Porifera
(vi) Chordata
(vii) Chordata
(viii) Chordata
(ix) Echinodermata
(x) Nematoda

(b) Study the figure below and answer the following questions:

(i) What is the aim of the experiment ?
(ii) Name the liquid taken in the test tube.
(iii) What change will you notice when air is blown into the tube and why ?
(iv) What will be the control in this experiment ?
Answer:
(i) The aim of the experiment is to show that exhaled air contains more carbon dioxide.
(ii) Liquid is lime water.
(iii) When air is blown into the tube, lime water turns milky. Lime water is calcium hydroxide [Ca(OH)₂] which when reacts with carbon dioxide gives calcium carbonate [ CaCO₃] which is a white precipitate that turns lime water milky. Ca(OH)₂ + CO₂ → CaCO₃ + H₂O
(iv) The control will be a test tube with lime water keeping undisturbed.

ICSE Class 9 Biology Question Papers with Answers

ICSE Class 9 Biology Sample Question Paper with Answers 2021-2022

• ICSE Class 9 Biology Question Paper 1 with Answers
• ICSE Class 9 Biology Question Paper 2 with Answers
• ICSE Class 9 Biology Question Paper 3 with Answers
• ICSE Class 9 Biology Question Paper 4 with Answers
• ICSE Class 9 Biology Question Paper 5 with Answers
• ICSE Class 9 Biology Question Paper 6 with Answers
• ICSE Class 9 Biology Question Paper 7 with Answers
• ICSE Class 9 Biology Question Paper 8 with Answers
• ICSE Class 9 Biology Question Paper 9 with Answers
• ICSE Class 9 Biology Question Paper 10 with Answers

ICSE Sample Papers for Class 9 with Answers