(English Medium)
Academic Year: 2025-2026
Date: March 2026
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- Answers to this Paper must be written on the paper provided separately.
- You will not be allowed to write during 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.
- Section A is compulsory. Attempt any four questions from Section B.
- The intended marks for questions or parts of questions are given in brackets [ ].
Allen’s blood report showed an abnormal decrease in the number of R.B.C. He is suffering from ______.
Polycythemia
Erythropenia
Glycosuria
Haemophilia
Chapter:
A farmer notices that storing ripe mangoes with unripe ones speeds up the ripening process. The phytohormone primarily responsible for this phenomenon is ______.
Auxins
Cytokinins
Gibberellins
Ethylene
Chapter:
Assertion (A): Oxygen is produced during light-dependent reactions of photosynthesis.
Reason (R): Oxygen is released as a byproduct during photolysis.
(A) is true and (R) is false.
(A) is false and (R) is true.
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
Chapter:
Reena gets emotionally stressed when the school examinations are approaching. Which hormone is responsible for this condition?
Adrenaline
Thyroxine
Insulin
Growth hormone
Chapter:
The diagram given below is that of a Neutrophil.
The function is ______.
secreting hormone
transporting food
phagocytosis
producing antibodies
Chapter:
Assertion (A): Pituitary gland is known as the master gland.
Reason (R): It regulates the activities of other exocrine glands.
(A) is true and (R) is false.
(A) is false and (R) is true.
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
Chapter:
Aruna went to a theatre to watch a movie on a bright sunny morning. As she came out of the theatre, she felt a dazzling effect and could not open her eyes. After a few minutes her vision became normal. This is due to:
Accommodation of eye
Mutation
Polarisation
Adaptation of eyes
Chapter:
Reflex actions provide a survival advantage because they ______.
are controlled by the cerebrum.
are controlled by the medulla oblongata.
require no conscious thought, allowing rapid responses.
always involve the spinal cord.
Chapter:
Industrial melanism is the phenomenon by which the peppered moth ______.
die due to industrial growth.
in polluted areas, became darker in colour for better camouflage.
became lighter in colour due to natural selection.
became resistant to industrial pollution.
Chapter:
The hormone that maintains the thickening of the endometrium during pregnancy is ______.
Oestrogen
ACTH
Progesterone
Oxytocin
Chapter:
The onset of menstruation in a human female is called ______.
Menopause
Menarche
Ovulation
Oogenesis
Chapter: [13] The Reproductive System
The number of autosomes and allosomes present in a human cell:
22 allosomes, 1 autosome
22 pairs of autosomes, 1 pair of allosome
22 autosomes, 1 allosome
22 pairs of allosomes, 1 pair of autosome
Chapter:
Cultural revolution favours a steep rise in human population. Identify the correct sequence of revolution:
Tool making, Scientific and Industrial, Agricultural
Agricultural, Tool making, Scientific and Industrial
Scientific and Industrial, Agricultural, Tool making
Tool making, Agricultural, Scientific and Industrial
Chapter:
Tanvi tried to match the phases of the menstrual cycle with the number of days as given in the table below:
| Phases | Days |
| P – Follicular Phase | Day 5 – 12 |
| Q – Luteal Phase | Day 15 – 28 |
| R – Menstrual Phase | Day 3 – 5 |
| S – Ovulatory Phase | Day 13 or 14 |
Identify the correct sequence:
P, Q, R, S
Q, S, R, P
R, P, S, Q
S, R, P, Q
Chapter:
Aditya, who is fond of roller skating. Identify the correct terms which help him to maintain his body balance:
Cerebellum, Semicircular canals, Vestibule
Vestibule, Sclera, Cerebrum
Malleus, Semicircular canals, Utriculus
Sacculus, Stapes, Cochlea
Chapter:
Give the biological/technical term for the following:
A mixture of smoke and fog.
Chapter:
Give the biological/technical term for the following:
The inner lining of the uterus.
Chapter:
Give the biological/technical term for the following:
The pressure that is responsible for the movement of water molecules across the cortical cells of the root.
Chapter:
Give the biological/technical term for the following:
The ground substance present in a chloroplast.
Chapter:
Give the biological/technical term for the following:
The fluid is present between the layers of meninges.
Chapter:
Given below is the diagram of a human heart. Read the information below the diagram and fill in the blanks:
|
The human heart pumps blood throughout the body. It is the size of a large fist. The heart is located between the lungs in the thoracic cavity. It has four chambers. The heart functions all through the lifespan of a person and is responsible for the survival of the person. |
The heart is enclosed by a membrane called (a) ______ (Pericardium/Pleura). The ventricles give rise to two large blood vessels called (b) ______ (Pulmonary vein/Pulmonary artery) and (c) ______ (Aorta/Venacava). The flaps of the cuspid valves are kept in position by (d) ______ (Chordae tendinae/Endometrium). (e) ______ (Hepatic/Coronary) arteries supply oxygenated blood to the walls of the heart.
Chapter:
Choose the odd term out from the following set of terms. Mention the category to which the remaining three belong.
Sulphur dioxide, Oxygen, Carbon monoxide, Nitrogen dioxide.
Chapter:
Choose the odd term out from the following set of terms. Mention the category to which the remaining three belong.
Pons, Epidermis, Xylem, Phloem.
Chapter:
Choose the odd term out from the following set of terms. Mention the category to which the remaining three belong.
Tympanum, Pinna, Auditory canal, Malleus.
Chapter:
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Choose the odd term out from the following set of terms. Mention the category to which the remaining three belong.
Ureter, Urethra, Uterus, Renal Pelvis.
Chapter:
Choose the odd term out from the following set of terms. Mention the category to which the remaining three belong.
Stomata, Lenticles, Cuticle, Root hair.
Chapter:
Rajeev, a 10 year old boy, went to an Ophthalmologist to get his eyes tested. He noticed a poster in the clinic with questions related to the parts of the human eye. Help Rajeev answer the questions:
- Which is the fluid that lubricates the eye?
- Which cells help in colour vision?
- Which nerve sends impulses from the eyeball to the brain?
- Name the structure that gives colour to the eyes.
- Name the part that allows entry of light rays into the eye.
Chapter:
Study the diagram given below and match the structure with its function:
Example: Scrotum - (f)
| Structure | Functions |
 |
(a) Secrete Testosterone |
| (b) Transports sperms to Epididymis | |
| (c) Stores sperm till maturation | |
| (d) Transport sperms to urethra | |
| (e) Produce sperms | |
| (f) Regulates temperature of Testis |
Chapter:
In what form is water lost during transpiration from plants?
Chapter:
In what form is water lost during guttation from plants?
Chapter:
Ayush was in the final round of a carrom match. He was focussing intently on the strokes of the opponent player.
- Which part of the brain helps Ayush to focus on the game?
- Name the part of the brain that co-ordinates his muscles while using the striker.
Chapter:
Draw a neat, labelled diagram of a cross section of an artery and a vein.
Chapter:
Differentiate between diabetes mellitus and diabetes insipidus (hormones involved).
Chapter: [9] The Excretory System
Give the common name of the plant on which Gregor Mendel conducted his breeding experiments.
Chapter:
Give the scientific name of the plant on which Gregor Mendel conducted his breeding experiments.
Chapter:
Name the tonicity of the solution for a living cell to show endosmosis.
Chapter:
Name the tonicity of the solutions for a living cell to show exosmosis.
Chapter:
Plant hormones are produced in extremely low concentrations in plants to regulate the physiological processes and tropic movements:
- Name one plant hormone responsible for the changes shown in the above picture.
- Identify a hormone that has an opposite effect to the one depicted in the picture.
- Give an example of a plant that shows Thigmotropism.
Chapter:
Mention any two objectives of ‘Swachh Bharat Abhiyan.’
Chapter:
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Arrange the following food chain in a proper sequence:
Small fish, Penguin, Algae, Seal, Mosquito larvae
Chapter:
Arrange the following food chain in a proper sequence:
Woodpecker, Caterpillar, Mountain lion, Fox, Cabbage
Chapter:
Mention the number of cranial nerves in a human being.
Chapter:
Mention the number of spinal nerves in a human being.
Chapter:
Surya used a plant with variegated leaves for an experiment on photosynthesis. He tested a leaf with iodine after keeping the plant in sunlight for a few hours.
- Which parts of the leaf will turn blue-black after the iodine test?
- What does this tell us about the role of chlorophyll in photosynthesis?
- Write the overall chemical equation for photosynthesis.
Chapter:
State the rate of transpiration when the air surrounding a plant has more atmospheric humidity.
Chapter:
State the rate of transpiration when the air surrounding a plant is hot and dry.
Chapter:
Write the full for of ACTH.
Chapter: [12] The Endocrine System
Expand the abbreviation ADH.
Chapter: [12] The Endocrine System
Which part of the ear equalizes air pressure on either side of the eardrum? Where is this structure located?
Chapter:
|
Santosh loved his garden, especially his pea plants. One year, he noticed that all the pea plants he grew from one batch of seeds had round seeds. Curious, he took the seeds from one of those plants and grew a new generation. To his surprise, 75% of the new plants had round seeds, but 25% had wrinkled seeds.
|
- What were the genotypes of the parent plants that Santosh originally planted?
- Which trait is dominant – round or wrinkled seeds?
- What is the genotypic ratio of the second generation (F2) plants?
Chapter:
Distinguish between the sympathetic system and the parasympathetic system on the basis of heartbeat.
Chapter:
Meena covered a potted plant, as shown below, with a transparent plastic bag. She observed water droplets inside the bag after a few hours when kept in sunlight. |
- Name the process that resulted in the formation of water droplets inside the bag.
- Define the process mentioned above.
Chapter:
Mention the regions of the kidney where we can find glomerulus.
Chapter:
Mention the regions of the kidney where we can find Henle’s loop.
Chapter:
Draw a neat, labelled diagram to show the internal structure of a root hair.
Chapter:
How does the ozone layer depletion affect life on earth?
Chapter:
Identical twins are always of the same gender. Explain why?
Chapter:
We should not insert sharp objects into the ear to remove ear wax. Give a suitable reason.
Chapter:
|
In a school experiment, a few students grow plants in pots placed horizontally as shown below. After a few days, the students observed that the roots bent downward, and the shoots curved upward.
|
- Name the tropic movement seen in shoots.
- Why do roots always grow downwards?
- Which phytohormone regulates the above tropic movements?
Chapter:
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CISCE previous year question papers ICSE Class 10 Biology with solutions 2025 - 2026
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