Olympiad – Class X – Science - Bio - Control and Co-ordination

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Question - 1

Which of these labelled parts controls peristaltic movements?

  • A W
  • B X
  • C Y
  • D Z

Question - 2

Which of the following parts make the peripheral nervous system?
(i) Spinal cord
(ii) Spinal nerves
(iii) Cranial nerves

  • A Only (i)
  • B Only (i) and (ii)
  • C Only (ii) and (iii)
  • D All the three

Question - 3

Which of the following statements distinguishes a motor neuron from a sensory neuron?
(i) It carries information to the brain.
(ii) It carries impulses away from the central nervous system.
(iii) Motor neurons carry information to the brain and impulses from the brain.

  • A Only (i)
  • B Only (i) and (ii)
  • C Only (ii)
  • D All the three

Question - 4

The sheath which covers the axon of a neuron is made up of

  • A glucose.
  • B protein.
  • C minerals.
  • D myelin.

Question - 5

The relay or connector neuron is located in which of the following parts?
(i) Brain
(ii) Spinal cord
(iii) Cranial nerves
(iv) Spinal nerves

  • A Only (i) and (ii)
  • B Only (i), (ii) and (iv)
  • C Only (ii), (iii) and (iv)
  • D All the four

Question - 6

Which of the following functions is performed by the sensory neuron?

  • A It transfers impulses from the receptor to the effector.
  • B It transfers impulses from the effector to the motor neuron.
  • C It transfers impulses from the receptor to the central nervous system.
  • D It transfers impulses from the central nervous system to the receptor.

Question - 7

Which of the following is the correct sequence of the components in the transfer of impulses in a reflex arc?
(i) Sensory nerve
(ii) Sensory organ
(iii) Muscle
(iv) Motor nerve

  • A i \(\rightarrow \) ii \(\rightarrow \) iii \(\rightarrow \) iv
  • B iv \(\rightarrow \) iii \(\rightarrow \) ii \(\rightarrow \) i
  • C ii \(\rightarrow \) i \(\rightarrow \) iv \(\rightarrow \) iii
  • D iii \(\rightarrow \) iv \(\rightarrow \) i  \(\rightarrow \) ii

Question - 8

Which of the following is an effector organ?
(i) Skin
(ii) Skeletal muscles
(iii) Salivary glands

  • A Only (i)
  • B Only (i) and (ii)
  • C Only (ii) and (iii)
  • D All the three

Question - 9

Which of the following Sequences is correct in transfer of impulses in a reflex arc?

  • A Receptor  \(\rightarrow \) sensory nerve \(\rightarrow \)  spinal cord \(\rightarrow \)  motor nerve \(\rightarrow \)  effector.
  • B Effector \(\rightarrow \)  motor nerve \(\rightarrow \)  spinal cord \(\rightarrow \)  sensory nerve \(\rightarrow \)  receptor.
  • C Spinal cord \(\rightarrow \) sensory nerve \(\rightarrow \) receptor \(\rightarrow \) motor nerve \(\rightarrow \) effector
  • D Spinal cord \(\rightarrow \) motor nerve \(\rightarrow \) effector \(\rightarrow \) sensory nerve \(\rightarrow \) receptor

Question - 10

Which of the following is an example of a reflex action?

  • A A knee-jerk
  • B Blinking of an eye
  • C Pumping of blood by the heart
  • D Both (A) and (B)
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