Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
BioNotesBioNotesCreated by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Online
Practice question paper (80 marks, 2 hours) for ICSE Class X Biology, Science Paper 3, 2027 pattern.
Maximum Marks: 80 | Time Allowed: Two Hours
Additional 15 minutes are allowed for reading the question paper only. You must NOT start writing during this time.
This is a practice paper prepared on the ICSE 2027 specimen pattern. Syllabus coverage follows the CISCE ICSE 2027 Biology (Science Paper 3) Class X syllabus.
Choose the correct answers to the questions from the given options. (Do not copy the question, write the correct answer only.)
(i) Dry raisins kept in water for a few hours become swollen and plump. This is due to:
(a) osmosis
(b) imbibition
(c) diffusion
(d) plasmolysis
(ii) Assertion (A): Mature mammalian red blood cells are highly efficient in oxygen transport.
Reason (R): They lack a nucleus, which provides more space for haemoglobin.
(a) (A) is true and (R) is false.
(b) (A) is false and (R) is true.
(c) Both (A) and (R) are true, and (R) is the correct explanation of (A).
(d) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(iii) Deficiency of which hormone during childhood results in dwarfism?
(a) Thyroxine
(b) Growth hormone
(c) Insulin
(d) Adrenaline
(iv) A cell having 8 chromosomes undergoes meiosis. The number of chromosomes in each daughter cell will be:
(a) 2
(b) 4
(c) 8
(d) 16
(v) A colour-blind man marries a woman of normal vision who is homozygous for the trait. Their daughters will be:
(a) all colour-blind
(b) all carriers with normal vision
(c) 50% colour-blind
(d) all normal and non-carriers
(vi) Which of the following statements are correct?
P – Stomata close when potassium ions move out of the guard cells.
Q – Cobalt chloride paper turns from blue to pink on absorbing moisture.
R – Phloem is responsible for the ascent of sap.
S – Auxin accumulates on the shaded side of a shoot during phototropism.
(a) P, Q and R
(b) P, Q and S
(c) Q, R and S
(d) P, R and S
(vii) The part of the brain that controls involuntary actions such as heartbeat and breathing is the:
(a) cerebrum
(b) cerebellum
(c) medulla oblongata
(d) thalamus
(viii) Ultrafiltration in the nephron takes place in the:
(a) proximal convoluted tubule
(b) Malpighian capsule
(c) loop of Henle
(d) distal convoluted tubule
(ix) Anita's grandfather cannot see nearby objects clearly. He holds the newspaper at arm's length to read. The defect and the suitable correction are:
(a) Myopia – concave lens
(b) Presbyopia – convex (bifocal) lens
(c) Cataract – cylindrical lens
(d) Astigmatism – concave lens
(x) The universal blood donor belongs to the blood group:
(a) A
(b) B
(c) AB
(d) O
(xi) Assertion (A): Tubectomy is a surgical method of birth control in females.
Reason (R): In tubectomy, the vas deferens is cut and tied.
(a) (A) is true and (R) is false.
(b) (A) is false and (R) is true.
(c) Both (A) and (R) are true, and (R) is the correct explanation of (A).
(d) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(xii) Acid rain is mainly caused by the release of:
(a) carbon monoxide and carbon dioxide
(b) sulphur dioxide and oxides of nitrogen
(c) chlorofluorocarbons
(d) methane
(xiii) Two heterozygous tall pea plants (Tt) are crossed and 200 offspring are obtained. The expected number of dwarf plants is:
(a) 25
(b) 50
(c) 100
(d) 150
(xiv) Which of the following ancestors of modern man had the largest cranial capacity?
(a) Australopithecus
(b) Homo habilis
(c) Homo erectus
(d) Neanderthal man
(xv) Which of the following is a non-biodegradable pollutant?
(a) Paper
(b) Vegetable peels
(c) DDT
(d) Cotton cloth
(i) Give the biological/technical terms for the following: [5]
(a) The light-sensitive pigment present in the rod cells of the retina.
(b) The loss of water in liquid form from the tips of leaves due to root pressure.
(c) The structure that holds the two sister chromatids together.
(d) The tube that carries urine from the kidney to the urinary bladder.
(e) The process by which root hair cells absorb mineral ions against the concentration gradient using energy.
(ii) Fill in the blanks by selecting the correct words from the word bank. [5]
Word bank: fibrinogen, calcium, heparin, prothrombin, platelets, plasma, haemoglobin, serum
(a) Blood clotting begins when damaged tissues and ______ release thromboplastin.
(b) Thromboplastin converts inactive ______ into active thrombin.
(c) Ions of ______ are essential for the above conversion.
(d) Thrombin converts soluble ______ into insoluble fibrin threads.
(e) ______ is an anticoagulant that prevents clotting inside blood vessels.
(iii) Choose the odd one out and name the category of the remaining three. [5]
(a) Cerebrum, Cerebellum, Spinal cord, Medulla oblongata
(b) Auxin, Gibberellin, Insulin, Cytokinin
(c) Phototropism, Geotropism, Hydrotropism, Transpiration
(d) Glomerulus, Bowman's capsule, Ureter, Loop of Henle
(e) Carbon dioxide, Methane, CFCs, Nitrogen
(iv) Case study [5]
Ravi accidentally touched a hot utensil and withdrew his hand instantly, even before he realised that it was hot.
(a) Name the type of action shown by Ravi.
(b) Name the part of the nervous system that acts as the centre for this action.
(c) Name the type of neuron that carries the impulse from the receptor to the spinal cord.
(d) State one difference between a reflex action and a voluntary action.
(e) Give one example of an acquired reflex.
(v) Match the hormones in Column A with their functions in Column B. [5]
One example is given: Insulin – (f)
| Column A | Column B |
|---|---|
| Oxytocin | (a) Stimulates contraction of uterine muscles during childbirth |
| ADH | (b) Increases reabsorption of water in the distal tubule and collecting duct |
| Glucagon | (c) Raises blood glucose by converting glycogen into glucose |
| Adrenaline | (d) Increases heartbeat and prepares the body for an emergency |
| Thyroxine | (e) Regulates the basal metabolic rate |
| Insulin | (f) Lowers blood glucose level (example) |
A potato tuber is hollowed out, filled with concentrated sugar solution and placed in a beaker of water. After a few hours the level of the solution in the cavity rises.
(i) Name the process demonstrated by this set-up. [1]
(ii) Define the process named above. [2]
(iii) What would happen to the level of the solution if the potato tuber were boiled before the experiment? Give a reason. [2]
(iv) State two differences between osmosis and diffusion. [2]
(v) Draw a neat, labelled diagram of Ganong's potometer. [3]
Meena's kidneys failed and her doctor advised her to undergo dialysis.
(i) Name the artificial process by which waste products are removed from Meena's blood. [1]
(ii) Name the blood vessels that carry blood (a) into and (b) out of the kidney. [2]
(iii) State two differences between the composition of the glomerular filtrate and urine. [2]
(iv) Name the part of the nephron where (a) ultrafiltration takes place and (b) selective reabsorption of glucose takes place. [2]
(v) Draw a neat, labelled diagram of a nephron showing at least six parts. [3]
Read the following passage and answer the questions that follow.
Over the last few decades, the burning of fossil fuels, large-scale deforestation and industrial activities have increased the concentration of certain gases in the atmosphere. These gases trap the heat radiated by the Earth's surface, causing a steady rise in the average temperature of the planet.
(i) Name the phenomenon described in the passage. [1]
(ii) Name two gases responsible for this phenomenon. [2]
(iii) State two consequences of this phenomenon. [2]
(iv) Name the gas layer depleted by chlorofluorocarbons (CFCs). State one harmful effect of its depletion on human health. [2]
(v) List any three measures to control air pollution. [3]
In pea plants, tallness (T) is dominant over dwarfness (t). A heterozygous tall pea plant is crossed with a dwarf pea plant.
(i) Name the scientist who proposed the laws of inheritance. [1]
(ii) Write the genotypes of the two parent plants and the types of gametes produced by each. [2]
(iii) Work out the cross using a Punnett square and state the phenotypic ratio of the offspring. [2]
(iv) Name the sex chromosomes present in a human male and a human female. Which parent determines the sex of the child? [2]
(v) Draw a neat, labelled diagram of a chromosome at metaphase showing at least four parts. [3]
A potted plant is kept in the dark for 48 hours. One of its leaves is then partly covered with black paper and the plant is placed in bright sunlight for several hours. The leaf is then tested for starch.
(i) What is the aim of this experiment? [1]
(ii) Why was the plant kept in the dark for 48 hours? What is this step called? [2]
(iii) Name the reagent used to test for starch. State the colour obtained in (a) the covered part and (b) the uncovered part of the leaf. [2]
(iv) Name the site of the light reaction in the chloroplast. State two products of the light reaction. [2]
(v) Draw a neat, labelled diagram of the internal structure of a chloroplast. [3]
(i) Name the layer of the eye that contains the light-sensitive cells. [1]
(ii) What is meant by accommodation of the eye? Name the muscles responsible for it. [2]
(iii) State the cause of myopia. How is it corrected? [2]
(iv) What is the blind spot? Why is it called so? [2]
(v) Draw a neat, labelled diagram of the human eye (vertical section). [3]