Chapter 7 · Control and Coordination

NCERT Exemplar Class 10 Science Chapter 7 Multiple Choice Questions

All 33 questions of NCERT Exemplar Class 10 Science Chapter 7 Multiple Choice Questions (Control and Coordination), in the book's order, each with its answer and a step-by-step solution.

1. Q1
   Which ​of the following statements ​is ​correct ​about ​receptors?

   1. (a)Gustatory receptors detect taste while olfactory receptors detect smell
   2. (b)Both gustatory and olfactory receptors detect smell
   3. (c)Auditory receptors detect smell and olfactory receptors detect taste
   4. (d)Olfactory receptors detect taste and gustatory receptors smell
   Show answer

   (a) Gustatory receptors detect taste while olfactory receptors detect smell

   Step-by-step solution →
2. Q2
   Electrical ​impulse travels ​in a ​neuron ​from

   1. (a)$\text{Dendrite}\to \text{axon}\to \text{axonal end}\to \text{cell body}$
   2. (b)$\text{Cell body}\to \text{dendrite}\to \text{axon}\to \text{axonal end}$
   3. (c)$\text{Dendrite}\to \text{cell body}\to \text{axon}\to \text{axonal end}$
   4. (d)$\text{Axonal end}\to \text{axon}\to \text{cell body}\to \text{dendrite}$
   Show answer

   (c) $\text{Dendrite}\to \text{cell body}\to \text{axon}\to \text{axonal end}$

   Step-by-step solution →
3. Q3
   In a ​synapse, chemical ​signal ​is transmitted ​from

   1. (a)dendritic end of one neuron to axonal end of another neuron
   2. (b)axon to cell body of the same neuron
   3. (c)cell body to axonal end of the same neuron
   4. (d)axonal end of one neuron to dendritic end of another neuron
   Show answer

   (d) axonal end of one neuron to dendritic end of another neuron

   Step-by-step solution →
4. Q4
   In a ​neuron, conversion ​of electrical ​signal to ​a ​chemical ​signal occurs ​at/in

   1. (a)cell body
   2. (b)axonal end
   3. (c)dendritic end
   4. (d)axon
   Show answer

   (b) axonal end

   Step-by-step solution →
5. Q5
   Which is the correct ​sequence ​of the ​components ​of a ​reflex ​arc?

   1. (a)$\text{Receptors}\to \text{Muscles}\to \text{Sensory neuron}\to \text{Motor neuron}\to \text{Spinal cord}$
   2. (b)$\text{Receptors}\to \text{Motor neuron}\to \text{Spinal cord}\to \text{Sensory neuron}\to \text{Muscle}$
   3. (c)$\text{Receptors}\to \text{Spinal cord}\to \text{Sensory neuron}\to \text{Motor neuron}\to \text{Muscle}$
   4. (d)$\text{Receptors}\to \text{Sensory neuron}\to \text{Spinal cord}\to \text{Motor neuron}\to \text{Muscle}$
   Show answer

   (d) $\text{Receptors}\to \text{Sensory neuron}\to \text{Spinal cord}\to \text{Motor neuron}\to \text{Muscle}$

   Step-by-step solution →
6. Q6
   Which of the ​following statements ​are ​true?

   1. (i)Sudden action in response to something in the environment is called reflex action
   2. (ii)Sensory neurons carry signals from spinal cord to muscles
   3. (iii)Motor ​neurons carry ​signals from receptors to spinal cord
   4. (iv)The path through which signals are transmitted from a receptor ​to a muscle or a ​gland is called ​reflex arc

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

   (c) (i) and (iv)

   Step-by-step solution →
7. Q7
   Which of the following ​statements are true about the ​brain?

   1. (i)The main thinking part of brain is hind brain
   2. (ii)Centres of hearing, smell, memory, ​sight etc ​are located in fore brain.
   3. (iii)Involuntary actions like salivation, vomiting, blood pressure are controlled by the medulla in the ​hind brain
   4. (iv)Cerebellum does not ​control posture and balance of the body

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

   (c) (ii) and (iii)

   Step-by-step solution →
8. Q8
   Posture ​and balance ​of ​the ​body is controlled ​by

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

   (b) cerebellum

   Step-by-step solution →
9. Q9
   Spinal cord originates from

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

   (b) medulla

   Step-by-step solution →
10. Q10
    The ​movement of shoot ​towards ​light ​is

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

    (d) phototropism

    Step-by-step solution →
11. Q11
    The ​main function ​of ​abscisic acid in plants is ​to

    1. (a)increase the length of cells
    2. (b)promote cell division
    3. (c)inhibit growth
    4. (d)promote growth of stem
    Show answer

    (c) inhibit growth

    Step-by-step solution →
12. Q12
    Which of ​the following is not ​associated ​with ​growth of plant?

    1. (a)Auxin
    2. (b)Gibberellins
    3. (c)Cytokinins
    4. (d)Abscisic acid
    Show answer

    (d) Abscisic acid

    Step-by-step solution →
13. Q13
    Iodine is necessary ​for ​the synthesis ​of ​which ​hormone?

    1. (a)Adrenaline
    2. (b)Thyroxin
    3. (c)Auxin
    4. (d)Insulin
    Show answer

    (b) Thyroxin

    Step-by-step solution →
14. Q14
    Choose ​the incorrect ​statement ​about insulin

    1. (a)It is produced from pancreas
    2. (b)It regulates growth and development of the body
    3. (c)It regulates blood sugar level
    4. (d)Insufficient secretion of insulin will cause diabetes
    Show answer

    (b) It regulates growth and development of the body

    Step-by-step solution →
15. Q15
    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 →
16. Q16
    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 →
17. Q17
    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 →
18. Q18
    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 →
19. Q19
    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 →
20. Q20
    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 →
21. Q21
    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 →
22. Q22
    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 →
23. Q23
    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 →
24. Q24
    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 →
25. Q25
    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 →
26. Q26
    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 →
27. Q27
    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 →
28. Q28
    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 →
29. Q29
    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 →
30. Q30
    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 →
31. Q31
    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 →
32. Q32
    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 →
33. Q33
    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 →