Class 10 Science · Chapter 6

Control and Coordination

175 Class 10 Science questions on Control and Coordination from the NCERT textbook, NCERT Exemplar and CBSE board papers 2024–2026, each with its answer and a step-by-step solution.

CBSE Class 10 Science previous year papers, with answers →

Questions · page 3 of 9

1. Q41 Exemplar · Multiple Choice Questions
   Select the mis-matched pair

   1. (a)Adrenaline : Pituitary gland
   2. (b)Testosterone : Testes
   3. (c)Estrogen : Ovary
   4. (d)Thyroxin : Thyroid gland
   Show answer

   (a) Adrenaline : Pituitary gland

   Step-by-step solution →
2. Q42 Exemplar · Multiple Choice Questions
   The ​shape ​of ​guard cells ​changes ​due to change ​in ​the

   1. (a)protein composition of cells
   2. (b)temperature of cells
   3. (c)amount of water in cells
   4. (d)position of nucleus in the cells
   Show answer

   (c) amount of water in cells

   Step-by-step solution →
3. Q43 Exemplar · Multiple Choice Questions
   The ​growth ​of ​tendril ​in pea plants ​is ​due ​to

   1. (a)effect of light
   2. (b)effect of gravity
   3. (c)rapid cell divisions in tendrillar cells that are away from the support
   4. (d)rapid cell divisions in tendrillar cells in contact with the support
   Show answer

   (c) rapid cell divisions in tendrillar cells that are away from the support

   Step-by-step solution →
4. Q44 Exemplar · Multiple Choice Questions
   The ​growth ​of ​pollen ​tubes towards ​ovules ​is due to

   1. (a)hydrotropism
   2. (b)chemotropism
   3. (c)geotropism
   4. (d)phototropism
   Show answer

   (b) chemotropism

   Step-by-step solution →
5. Q45 Exemplar · Multiple Choice Questions
   The movement ​of ​sunflower ​in accordance ​with ​the ​path of sun is due to

   1. (a)phototropism
   2. (b)geotropism
   3. (c)chemotropism
   4. (d)hydrotropism
   Show answer

   (a) phototropism

   Step-by-step solution →
6. Q46 Exemplar · Multiple Choice Questions
   The substance ​that ​triggers the fall of mature ​leaves and fruits from plants ​is ​due ​to

   1. (a)auxin
   2. (b)gibberellin
   3. (c)abscisic acid
   4. (d)cytokinin
   Show answer

   (c) abscisic acid

   Step-by-step solution →
7. Q47 Exemplar · Multiple Choice Questions
   Which of the following ​statements ​about ​transmission ​of nerve ​impulse is incorrect?

   1. (a)Nerve impulse travels from dendritic end towards axonal end
   2. (b)At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron
   3. (c)The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron
   4. (d)A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells
   Show answer

   (b) At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron

   Step-by-step solution →
8. Q48 Exemplar · Multiple Choice Questions
   Involuntary ​actions ​in ​the body ​are ​controlled ​by

   1. (a)medulla in fore brain
   2. (b)medulla in mid brain
   3. (c)medulla in hind brain
   4. (d)medulla in spinal cord
   Show answer

   (c) medulla in hind brain

   Step-by-step solution →
9. Q49 Exemplar · Multiple Choice Questions
   Which ​of ​the ​following is ​not an involuntary ​action?

   1. (a)Vomiting
   2. (b)Salivation
   3. (c)Heart beat
   4. (d)Chewing
   Show answer

   (d) Chewing

   Step-by-step solution →
10. Q50 Exemplar · Multiple Choice Questions
    When ​a person ​is ​suffering from severe cold, he ​or she ​cannot

    1. (a)differentiate the taste of an apple from that of an ice cream
    2. (b)differentiate the smell of a perfume from that of an agarbatti
    3. (c)differentiate red light from green light
    4. (d)differentiate a hot object from a cold object
    Show answer

    (b) differentiate the smell of a perfume from that of an agarbatti

    Step-by-step solution →
11. Q51 Exemplar · Multiple Choice Questions
    What ​is the correct ​direction of ​flow ​of electrical ​impulses?

    1. (a)(a)
    2. (b)(b)
    3. (c)(c)
    4. (d)(d)
    Show answer

    (c) (c)

    Step-by-step solution →
12. Q52 Exemplar · Multiple Choice Questions
    Which ​statement ​is ​not ​true ​about thyroxin?

    1. (a)Iron is essential for the synthesis of thyroxin
    2. (b)It regulates carbohydrates, protein and fat metabolism in the body
    3. (c)Thyroid gland requires iodine to synthesise thyroxin
    4. (d)Thyroxin is also called thyroid hormone
    Show answer

    (a) Iron is essential for the synthesis of thyroxin

    Step-by-step solution →
13. Q53 Exemplar · Multiple Choice Questions
    Dwarfism results due to

    1. (a)Excess secretion of thyroxin
    2. (b)Less secretion of growth hormone
    3. (c)Less secretion of adrenaline
    4. (d)Excess secretion of growth hormone
    Show answer

    (b) Less secretion of growth hormone

    Step-by-step solution →
14. Q54 Exemplar · Multiple Choice Questions
    Dramatic ​changes of body features ​associated with ​puberty are mainly because ​of ​secretion ​of

    1. (a)oestrogen from testes and testosterone from ovary
    2. (b)estrogen from adrenal gland and testosterone from pituitary gland
    3. (c)testosterone from testes and estrogen from ovary
    4. (d)testosterone from thyroid gland and estrogen from pituitary gland
    Show answer

    (c) testosterone from testes and estrogen from ovary

    Step-by-step solution →
15. Q55 Exemplar · Multiple Choice Questions
    A doctor advised a ​person to take an ​injection ​of ​insulin ​because

    1. (a)his blood pressure was low
    2. (b)his heart was beating slowly
    3. (c)he was suffering from goitre
    4. (d)his sugar level in blood was high
    Show answer

    (d) his sugar level in blood was high

    Step-by-step solution →
16. Q56 Exemplar · Multiple Choice Questions
    The ​hormone which ​increases ​the ​fertility in ​males ​is called

    1. (a)oestrogen
    2. (b)testosterone
    3. (c)insulin
    4. (d)growth hormone
    Show answer

    (b) testosterone

    Step-by-step solution →
17. Q57 Exemplar · Multiple Choice Questions
    Which ​of the ​following ​endocrine glands is ​unpaired?

    1. (a)Adrenal
    2. (b)Testes
    3. (c)Pituitary
    4. (d)Ovary
    Show answer

    (c) Pituitary

    Step-by-step solution →
18. Q58 Exemplar · Multiple Choice Questions
    Junction ​between ​two ​neurons ​is called

    1. (a)cell junction
    2. (b)neuro muscular junction
    3. (c)neural joint
    4. (d)synapse
    Show answer

    (d) synapse

    Step-by-step solution →
19. Q59 Exemplar · Multiple Choice Questions
    In ​humans, ​the ​life processes are controlled ​and regulated ​by

    1. (a)reproductive and endocrine systems
    2. (b)respiratory and nervous systems
    3. (c)endocrine and digestive systems
    4. (d)nervous and endocrine systems
    Show answer

    (d) nervous and endocrine systems

    Step-by-step solution →
20. Q60 Exemplar · Short Answer Questions
    Label ​the ​parts (a), ​(b), ​(c) and ​(d) and show the direction ​of flow of electrical ​signals in ​Figure 7.2.

    Show answer

    (a) Sensory neuron, (b) spinal cord, (c) motor neuron, (d) muscle; the impulse flows one way, from receptor to effector.

    (a) Sensory neuron; (b) Spinal cord; (c) Motor neuron; (d) Muscle, the effector. Direction of flow: the impulse starts at the receptors in the skin of the hand and travels along the sensory neuron (a) to the spinal cord (b), where a relay neuron passes it to the motor neuron (c), which carries it to the muscle (d); the muscle contracts and the hand is pulled away. The flow is one way only, from receptor to effector.

    Step-by-step solution →