Class 10 Science · Chapter 6

Control and Coordination

286 Class 10 Science questions on Control and Coordination from the NCERT textbook, NCERT Exemplar and CBSE board papers 2018–2026, each with its answer and a step-by-step solution.

CBSE Class 10 Science previous year papers, with answers →

Questions · page 11 of 15

1. Q201 CBSE 2024
   (i) What ​are tropic movements ? Give an ​example ​of ​a plant hormone which

   1. (1)inhibits growth and
   2. (2)promotes cell division. (ii) Explain ​directional movement of a tendril in ​pea plant in response to touch. Name the hormone responsible for this ​movement.
   Show answer

   Tropic movements are directional growth responses to a stimulus; abscisic acid inhibits growth, cytokinin promotes cell division, and auxin makes the pea tendril coil.

   (i) Tropic movements are directional growth movements of a plant part in response to a stimulus such as light, gravity, water, chemicals or touch: the part grows towards the stimulus (positive) or away from it (negative), as when a shoot bends towards light. (1) A hormone that inhibits growth: abscisic acid. (2) A hormone that promotes cell division: cytokinin. (ii) The tendrils of a pea plant are sensitive to touch. When a tendril touches a support, the part in contact with the support grows more slowly than the part away from it. The faster growth of the far side makes the tendril curl towards the support, circle round it and cling to it. The hormone responsible for this movement is auxin.

   Step-by-step solution →
2. Q202 CBSE 2024
   1. (i)Leaves of ‘chhui-mui’ plant begin to fold up and droop in response to ​a stimulus. ​Name the stimulus and write ​the ​cause for such ​a rapid movement. Is there any growth ​involved in the movement?
   2. (ii)Define geotropism in plants. What ​is meant by positive and negative geotropism? Give one example ​of each type.
   Show answer

   Touch is the stimulus, leaf cells lose water and shrink with no growth involved; roots show positive geotropism and shoots negative geotropism.

   (i) The stimulus is touch. When the plant is touched, the information is passed from cell to cell by electrical-chemical means; cells of the leaf then change shape by changing the amount of water in them (they lose water and shrink), so the leaflets fold up and the leaf droops. No growth is involved in this movement. (ii) Geotropism is the growth movement of a plant part in response to gravity. Positive geotropism is growth towards gravity (downwards), for example the root; negative geotropism is growth away from gravity (upwards), for example the shoot (stem).

   Step-by-step solution →
3. Q203 CBSE 2023
   Walking ​in a straight line and riding a bicycle are the activities which are possible due ​to ​a part of the brain. ​Choose the correct ​location and name ​of this part from the given table :

   Location and name offered for the part of the brain

   Option	Part of the Brain	Name
   (a)	Fore brain	Cerebrum
   (b)	Mid brain	Hypothalamus
   (c)	Hind brain	Cerebellum
   (d)	Hind brain	Medulla

   1. (a)Fore brain — Cerebrum
   2. (b)Mid brain — Hypothalamus
   3. (c)Hind brain — Cerebellum
   4. (d)Hind brain — Medulla
   Show answer

   (c) Hind brain — Cerebellum

   Step-by-step solution →
4. Q204 CBSE 2023
   The ​organ that ​secretes ​insulin is ​:

   1. (a)gall bladder
   2. (b)small intestine
   3. (c)pancreas
   4. (d)stomach
   Show answer

   (c) pancreas

   Step-by-step solution →
5. Q205 CBSE 2023
   Spinal cord originates from :

   1. (a)Cerebellum
   2. (b)Pons
   3. (c)Hypothalamus
   4. (d)Medulla
   Show answer

   (d) Medulla

   Step-by-step solution →
6. Q206 CBSE 2023
   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.
   Show answer

   (d) It is a growth related movement.

   Step-by-step solution →
7. Q207 CBSE 2023
   In ​plants ​the role ​of ​cytokinin is :

   1. (a)Promote cell division.
   2. (b)Wilting of leaves.
   3. (c)Promote the opening of stomatal pore.
   4. (d)Help in the growth of stem.
   Show answer

   (a) Promote cell division.

   Step-by-step solution →
8. Q208 CBSE 2023
   The ​part in which gustatory receptors ​are present ​in our ​body ​is ​:

   1. (a)inner ear
   2. (b)skin
   3. (c)tongue
   4. (d)inner lining of nose
   Show answer

   (c) tongue

   Step-by-step solution →
9. Q209 CBSE 2023
   The voluntary actions ​such ​as ​reading and ​writing ​are controlled ​by ​:

   1. (a)cerebellum
   2. (b)cerebrum
   3. (c)medulla
   4. (d)pons
   Show answer

   (b) cerebrum

   Step-by-step solution →
10. Q210 CBSE 2023
    Select the mismatched pair :

    1. (a)Adrenal gland – Adrenaline
    2. (b)Thyroid gland – Thyroxin
    3. (c)Pituitary gland – Insulin
    4. (d)Ovary – Estrogen
    Show answer

    (c) Pituitary gland – Insulin

    Step-by-step solution →
11. Q211 CBSE 2023
    Sensory nerve ​of a ​reflex ​arc carries information from the ​receptor cells ​to ​the ​:

    1. (a)spinal cord
    2. (b)brain
    3. (c)muscles of the effector organ
    4. (d)bones of the receptor organ
    Show answer

    (a) spinal cord

    Step-by-step solution →
12. Q212 CBSE 2023
    Two statements are given — one ​labelled as ​Assertion ​(A) and the other labelled as ​Reason (R). ​Select the correct answer to ​this question from the codes (a), (b), (c) and (d) as given below.

    Assertion (A): A hormone called abscisic acid inhibits growth in plants.

    Reason (R): The role of auxins is opposite to that of abscisic acid in plants.

    1. (a)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
    2. (b)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
    3. (c)Assertion (A) is true, but Reason (R) is false.
    4. (d)Assertion (A) is false, but Reason (R) is true.
    Show answer

    (b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).

    Step-by-step solution →
13. Q213 CBSE 2023
    Two statements ​are given — one labelled as Assertion (A) ​and the other labelled as ​Reason (R). Select the ​correct answer to this question from the codes ​(a), (b), ​(c) ​and (d) as given below.

    Assertion (A): Cytokinins are present, in greater concentration in areas of rapid cell division such as fruits and seeds.

    Reason (R): Cytokinins promote cell division.

    1. (a)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
    2. (b)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
    3. (c)Assertion (A) is true, but Reason (R) is false.
    4. (d)Assertion (A) is false, but Reason (R) is true.
    Show answer

    (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).

    Step-by-step solution →
14. Q214 CBSE 2023
    Two statements are given — ​one ​labelled as Assertion (A) and the other labelled ​as Reason (R). Select ​the correct answer to ​this question from the codes (a), (b), (c) ​and ​(d) as given below.

    Assertion (A): Pancreas produces a hormone called insulin.

    Reason (R): Insulin increases the blood sugar level in the human body.

    1. (a)Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of the Assertion (A).
    2. (b)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
    3. (c)Assertion (A) is true, but Reason (R) is false.
    4. (d)Assertion (A) is false, but Reason (R) is true.
    Show answer

    (c) Assertion (A) is true, but Reason (R) is false.

    Step-by-step solution →
15. Q215 CBSE 2023
    A plant hormone ​helps in ​bending of stem towards light. Name the ​hormone ​and explain how ​is the ​movement ​achieved.
    Show answer

    The hormone is auxin; it collects on the shaded side, making those cells grow longer, so the stem bends towards the light (phototropism).

    The hormone is auxin. It is synthesised at the tip of the shoot and helps the cells to grow longer. When light falls on the shoot from one side, auxin diffuses towards the shaded side of the shoot. The higher concentration of auxin there makes the cells on the shaded side grow longer than those on the lit side, so the shaded side lengthens more and the stem bends towards the light. This growth movement is called phototropism.

    Step-by-step solution →
16. Q216 CBSE 2023
    Name ​a plant ​hormone responsible for bending of a ​shoot of a ​plant ​when it is exposed to unidirectional light. How does ​it promote phototropism ?
    Show answer

    Auxin gathers on the shaded side, making its cells grow longer, so the shoot bends towards the light.

    The hormone is auxin. It is synthesised at the tip of the shoot and helps the cells to grow longer. When light falls on the shoot from one side, auxin diffuses towards the shaded side, so its concentration there becomes higher. The cells on the shaded side therefore grow longer than those on the lit side, and the shoot bends towards the light: this is positive phototropism.

    Step-by-step solution →
17. Q217 CBSE 2023
    1. (a)How is ​the brain and spinal cord protected in human beings ​?
    2. (b)State one ​main function each of (i) Medulla and (ii) ​Cerebellum.
    Show answer

    Cranium and fluid-filled meninges protect the brain, the vertebral column the spinal cord; the medulla controls involuntary actions and the cerebellum balance.

    (a) The brain is protected by a bony box, the cranium (skull). Inside this box it lies in a fluid-filled balloon: three membranes, the meninges, hold cerebrospinal fluid around it, and this fluid acts as a shock absorber. The spinal cord is protected by the vertebral column (backbone), inside which it too is wrapped in the meninges and cerebrospinal fluid. (b) (i) Medulla: it controls involuntary actions such as blood pressure, salivation and vomiting. (ii) Cerebellum: it is responsible for the precision of voluntary actions and for maintaining the posture and balance of the body.

    Step-by-step solution →
18. Q218 CBSE 2023
    1. (a)Write the role of insulin in regulating ​blood sugar levels in human ​body. Mention the disease caused due to it.
    2. (b)How is the ​timing and the ​amount of release of ​insulin in the blood regulated ​?
    Show answer

    Insulin lowers blood sugar and its deficiency causes diabetes mellitus; rising blood glucose makes the pancreas release more insulin, falling glucose less.

    (a) Insulin, secreted by the pancreas, lowers the blood sugar level: it makes body cells take up glucose from the blood and makes the liver and muscles store the surplus as glycogen. If the pancreas secretes too little insulin, blood sugar stays high and the person suffers from diabetes mellitus. (b) The secretion is regulated by a feedback mechanism - the blood glucose level itself. A rise in blood glucose stimulates the pancreas to release more insulin; as the level falls back to normal, less insulin is released.

    Step-by-step solution →
19. Q219 CBSE 2023
    Write the name ​and function of parts ​

    1. (i)​and
    2. (ii)in ​the ​diagram of a ​neuron ​given below.

    Show answer

    (i) Dendrite receives the stimulus; (ii) axon conducts the nerve impulse away from the cell body to the nerve ending.

    (i) Dendrite. It receives the stimulus: a chemical change at the dendritic tip sets off an electrical impulse, which the dendrite carries towards the cell body. (ii) Axon. It conducts that nerve impulse away from the cell body to the nerve ending, where chemicals are released to carry the signal across the synapse to the next cell.

    Step-by-step solution →
20. Q220 CBSE 2023
    Name the part ​of ​brain which ​is responsible ​for ​the ​following actions :

    1. (i)Maintaining posture ​and balance
    2. (ii)Beating of heart
    3. (iii)Thinking
    4. (iv)Blood pressure
    Show answer

    Cerebellum maintains posture and balance, medulla controls heartbeat and blood pressure, and cerebrum is responsible for thinking.

    (i) Maintaining posture and balance: cerebellum (hind-brain). (ii) Beating of heart: medulla (hind-brain). (iii) Thinking: cerebrum, the fore-brain. (iv) Blood pressure: medulla (hind-brain).

    Step-by-step solution →