Recap- Control and Coordination

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

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

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

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

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.

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 → ii → iii → iv
• B) iv → iii → ii → I
• C) ii → i → iv → iii
• D) iii → iv → i → ii

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

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

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

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)

Which of the following is/are the characteristic features of reflex action?

• A) It is a fast response.
• B) It is an automatic response.
• C) It is an involuntary action.
• D) All of these

Which of the following hormones prevents water loss from plants?

• A) Gibberellins
• B) ethylene
• C) cytokinin
• D) ABA