Control and Coordination

2026Very short answer·2 marks·Q12(b)Reflex action and the reflex arc

Sunil unconsciously touched the hot iron rod and immediately withdrew his hand. Which type of action is involved? Also define this action. Draw a flow chart to show the path followed for this action.

2026MCQ·1 mark·Q5The human brain

Following are the statements about the different parts of the brain. Select the correct statements. (i) The thinking part of the brain is the forebrain. (ii) Centres for smell, hearing, memory, sight are located in forebrain. (iii) Salivation, vomiting, blood pressure are controlled by medulla in the hind brain. (iv) Cerebellum does not control the posture and balance of the body.

1. (a) (i), (ii) and (iii)
2. (b) (ii), (iii) and (iv)
3. (c) (i), (ii) and (iv)
4. (d) (i), (iii) and (iv)

2026Case based·1 mark·Q15(a)Coordination in plants: tropisms and plant hormones

Plants exhibit movements in response to environmental stimuli (light, gravity, water, chemicals) regulated by plant hormones; roots and shoots show contrasting responses to the same stimulus. Why is hydrotropism essential for plants?

2026Case based·1 mark·Q15(b)Coordination in plants: tropisms and plant hormones

Plants show movements in response to environmental stimuli regulated by plant hormones. What role does auxin play in the growth of plants?

2026Case based·2 marks·Q15(c)Coordination in plants: tropisms and plant hormones

Plants show movements in response to environmental stimuli regulated by plant hormones. Differentiate between movement shown by the sensitive plant and tropic movement by plants (Two points).

2026Case based·2 marks·Q15(c-OR)Coordination in plants: tropisms and plant hormones

Plants show movements in response to environmental stimuli regulated by plant hormones. OR alternative for (c): How does movement of roots differ from that of shoots in response to gravity and light?

2026Very short answer·2 marks·Q12(a)Hormones in animals

Varun is diabetic. His latest ultrasound reports showed a blockage in his pancreatic duct. How will this affect the dual functioning of the pancreas?

2025Short answer·3 marks·Q29Coordination in plants: tropisms and plant hormones

Plants have neither a nervous system nor muscles, even then they respond to stimuli. For example, the leaves of chhui-mui (touch-me-not) plant when touched begin to fold up and droop. (a) How is the information communicated in "touch-me-not" plants ? (b) What enables the plant cells to bring out the observable response ? (c) Differentiate the movement mentioned above from the movement of tendrils in a pea plant.

2025MCQ·1 mark·Q9Coordination in plants: tropisms and plant hormones

The plant hormone whose concentration stimulates the cells to grow longer on the side of the shoot which is away from light is :

1. (a) Cytokinins
2. (b) Gibberellins
3. (c) Adrenaline
4. (d) Auxins

2024MCQ·1 mark·Q10The nervous system and how a neuron works

In a nerve cell, the site where the electrical impulse is converted into a chemical signal is known as:

1. (a) Axon
2. (b) Dendrites
3. (c) Neuromuscular junction
4. (d) Cell body

2024Short answer·3 marks·Q30Reflex action and the reflex arc

Define reflex action. With the help of a flow chart show the path of a reflex action such as sneezing.

2024Very short answer·2 marks·Q23(a)Coordination in plants: tropisms and plant hormones

How is the movement of leaves of a sensitive plant different from the downward movement of the roots?

2024Very short answer·2 marks·Q23(b)Hormones in animals

There is a hormone which regulates carbohydrate, protein and fat metabolism in our body. Name the hormone and the gland which secretes it. Why is it important for us to have iodised salt in our diet?

2023MCQ·1 mark·Q11Coordination in plants: tropisms and plant hormones

Select from the following the correct statement about tropic movement in plants:

1. (a) It is due to stimulus of touch and temperature.
2. (b) It does not depend upon the direction of stimulus received.
3. (c) It is observed only in roots and not in stems.
4. (d) It is a growth related movement.

2023Very short answer·2 marks·Q22Hormones in animals

(a) Write the role of insulin in regulating blood sugar levels in human body. Mention the disease caused due to it. (b) How is the timing and the amount of release of insulin in the blood regulated?