ICSE Class 10 Biology Pre Board Question Paper 2026: Important Questions for High Marks

Particulars

Details

Exam Name

ICSE Class 10 Biology Examination 2026

Conducting Body

Council for the Indian School Certificate Examinations (CISCE)

Subject

Biology

Paper Name

Science Paper 3 (Biology)

Exam Type

Pre Board (School-Level Assessment)

Exam Date

Friday, 13 March 2026

Exam Time

11:00 AM

Exam Mode

Offline (Pen and Paper)

Exam Duration

3 Hours

Total Marks

100 Marks

External Exam Marks

80 Marks

Internal Assessment Marks

20 Marks

Exam Pattern

Section A (40 Marks) + Section B (40 Marks)

Official Website

cisce.org

Question Number

Questions

Marks

SECTION A (40 Marks)

(Attempt all questions from this Section)

1

(i) Given below is the structure of the human ear. Read the information below the diagram and fill in the blanks:

The human ear is concerned with two functions, hearing and body balance. It has three main divisions:
(i) outer ear, (ii) middle ear and (iii) inner ear.

The (a) ______ ear contains three tiny bones – (b) ______, (c) ______ and (d) ______ and a eustachian tube which connects the cavity of the middle ear with the throat.
The three bones are collectively called the (e) ______.

(ii) Read the explanations given below and name the structure: 

Example: The largest gland in the human body that secretes bile.

(a) The part of the brain concerned with memory

(b) The organ through which urea is released outside the body of a human being

(c) It is popularly called the master gland because it seems to control practically all other endocrine glands

(d) The blood vessel which starts from capillaries and ends in capillaries

(e) A muscular tube (10–15 cm long) starting from the lower end of the uterus upto the outside

(iii) Name the following:

(a) The tissue concerned with upward conduction of water in plants

(b) The first form of food substance produced during photosynthesis

(c) A growth-retarding hormone in plants

(d) The proteins that help in the coiling and packaging of DNA into structural units called nucleosomes

(e) The structure in a leaf that allows guttation

(iv) Observe the diagrams (A – Vasectomy and B – Tubectomy) given below and match the structure marked 1 to 5 from Column A with the correct labelling from Column B:

(v) Arrange and rewrite the terms in each group in the correct order to be in a logical sequence beginning with the term that is underlined:

(a) Right ventricle, Lungs, Pulmonary vein, Pulmonary artery

(b) Implantation, Ovulation, Child birth, Gestation, Fertilisation

(c) Effector, Receptor, CNS, Stimulus

(d) Australopithecus, Homo erectus, Ramapithecus, Homo habilis

(e) Glomerulus, Collecting duct, Loop of Henle, Distal convoluted tubule

[25]

2

Choose the correct answers to the questions from the given options. 

(i) Which of the following hormones stimulates milk secretion?

(a) Prolactin

(b) Oxytocin

(c) Progesterone

(d) Calcitonin

(ii) The famous book “The Origin of Species” was written by:

(a) Carl Linnaeus

(b) Charles Darwin

(c) Jean-Baptiste Lamarck

(d) Gregor Mendel

(iii) The hormone which promotes the ripening of fruit is:

(a) Auxins

(b) Gibberellins

(c) Cytokinins

(d) Ethylene

(iv) Assertion (A): Hormones are the secretions from some glandular parts of the body which regulate certain physiological processes by chemical means.

Reason (R): Hormones are directly poured into the target organs, which are usually very close to the source/gland secreting the hormones.

(a) A is True and R is False

(b) A is False and R is True

(c) Both A and R are True

(d) Both A and R are False

(v) Which of the following is not applicable to the process of photosynthesis?

(a) Oxygen is evolved

(b) Carbon dioxide is absorbed

(c) Carbon dioxide is evolved

(d) Water is utilized

(vi) The upper layer of mesophyll in a leaf consists of elongated ground tissue called:

(a) Spongy parenchyma

(b) Palisade cells

(c) Xylem cells

(d) Phloem cells

(vii) Assertion (A): Haematuria is the condition in which the blood passes with urine due to some infection in the urinary tract, kidney stones or tumour.

Reason (R): An excessive number of RBCs and haemoglobin is produced in the bone marrow, so these are excreted out through the urine.

(a) A is True and R is False

(b) A is False and R is True

(c) Both A and R are True

(d) Both A and R are False

(viii) Assertion (A): Active transport does not occur through a non-living semi-permeable membrane.

Reason (R): Active transport is in a direction opposite to that of diffusion, i.e. from a region of lower concentration to higher concentration.

(a) A is True and R is False

(b) A is False and R is True

(c) Both A and R are True

(d) Both A and R are False

(ix) The number of cranial and spinal nerves in human beings are respectively:

(a) 31, 12 pairs

(b) 32, 21 pairs

(c) 12, 31 pairs

(d) 31, 21 pairs

(x) During ventricular systole, the atrioventricular valves (P) ______ and semilunar valves (Q) ______.

(a) P – Close, Q – Open

(b) P – Close, Q – Close

(c) P – Open, Q – Close

(d) P – Open, Q – Open

(xi) A biology teacher asked her students to give two examples of dominant trait of pea plant.

• Raj said: Purple flower and yellow seed

• Sonu said: Wrinkled seed and yellow pod

• Lata said: White flower and constricted pod

• Abhay said: Round seed and inflated pod

Who were correct?
(a) Abhay and Sonu
(b) Sonu and Lata
(c) Raj and Lata
(d) Abhay and Raj

(xii) Assertion (A): Meiosis is the kind of cell-division which occurs during gamete formation in the gonads.

Reason (R): During meiosis, chromosome number remains the same in parent cell and daughter cells which is very significant to maintain the identity of the organism.

(a) A is True and R is False

(b) A is False and R is True

(c) Both A and R are True

(d) Both A and R are False

(xiii) What type of waste is depicted in the image given below?

(a) Biomedical waste

(b) Domestic waste

(c) Industrial waste

(d) Urban waste

(xiv) Which of the following is non-biodegradable?

(a) Tea leaves

(b) Wood

(c) Animal bones

(d) Nylon

(xv) Sam tried to match the organ with their products. He tabulated the pairs as follows:

Identify the correct pair:
(a) P – Testes, Q – Uterus
(b) P – Sperm duct, Q – Ovaries
(c) P – Ovaries, Q – Testes
(d) P – Testes, Q – Ovaries

[15]

SECTION B (40 Marks)

(Attempt any four questions from this Section)

3

(i) What are fraternal twins? 

(ii) State any two factors responsible for population explosion in India.

(iii) Differentiate between the terms rods and cones.

(iv) State and explain Mendel’s Law of Dominance. 

(v) Draw a neat, labelled diagram of a duplicated chromosome.

4

(i) Give the exact location of adrenal glands. 

(ii) Give two precautions while using the potometer.

(iii) When are the sounds “LUBB” and “DUPP” produced respectively during heart beat? 

(iv) What do you understand by Meninges and Meningitis?

(v) The following phenomenon provides a classical explanation of a scientific theory given by a certain scientist: 

(a) Name the said theory

(b) Explain the said theory

(c) Give the name of the scientist who gave this theory

5

(i) What is photolysis of water? 

(ii) How is Endosmosis different from Exosmosis? 

(iii) Explain the following terms:

(a) Variation

(b) Mutation 

(iv) State any two functions of the spinal cord. 

(v) Study the diagram below and then answer the question that belows:

(a) Name the cells of the pancreas that produce insulin.

(b) Name the cells of the pancreas that produce glucagon.

(c) State the main function of glucagon.

6

(i) Name the hormone which is associated with the ‘reabsorption’ step of urine production. 

(ii) Given below are two statements which are incorrect. Rewrite the correct statements: 

(a) The fossil history of humans is complete

(b) Evolution is promptly ending process

(iii) Give any two main forces which contribute to the upward movement (ascent) of sap. 

(iv) The figure given below depicts roots of a tree growing towards the water line of a house. Study the same and answer the following questions:

(a) What kind of a tropic movement is shown in the figure?

(b) Define the tropic movement shown in the figure

(v) Draw a neat, labelled diagram of human sperm.

7

(i) Define Aster.
(ii) Name the stimulus which causes the following movements in plants:
(a) Thigmotropism
(b) Phototropism
(iii) State the difference between Autosomes and Sex chromosomes.
(iv) Give reasons: The left ventricle has thicker walls than the right ventricle.
(v) Look at a cartoonist’s presentation of a kind of pollution given below:

(a) Name the kind of pollution
(b) List the source of pollution
(c) Mention any one harmful effect of this pollution

8

(i) Give reason: Blind spot is considered as “area of no vision”. 

(ii) Write the full forms of:

(a) ODF

(b) CNG [2]

(iii) State any two adaptations in plants to reduce excessive transpiration. 

(iv) List any two accessory excretory organs in humans. 

(v) Draw a neat, labelled diagram of a chloroplast. 

ICSE Class 10 Biology Pre Board Question Paper 2026 PDF

Unit

Chapter Names

Section A Weightage (40 marks)

Section B Weightage (40 marks)

Total Weightage

Unit 1: Basic Biology

Structure of Chromosomes, Cell Division

2

9

11 marks

Genetics

2

11

13 marks

Absorption by Roots

3

1

4 marks

Unit 2: Plant Physiology

Transpiration

1

0

1 marks

Photosynthesis

3

10

13 marks

Chemical Co-ordination of Plants

1

3

4 marks

Unit 3: Human Anatomy & Physiology

The Circulatory System

3

5

8 marks

The Excretory System

5

0

5 marks

The Nervous System

11

5

16 marks

Sense Organs

5

4

9 marks

The Endocrine System

2

0

2 marks

The Reproduction System

2

6

8 marks

Unit 4

Human Evolution

1

5

6 marks

Unit 5

Population

1

0

1 mark

Unit 6

Pollution

3

5

8 marks