Question

Assertion (A): Effectors are the part of our body which, on receiving stimulus, set up waves of impulses towards the central nervous system.

Reason (R): The specialized epithelial cells of certain organs are capable of receiving stimuli which can be light, sound, heat, pain, hunger, etc.

1. A is True and R is False.
2. A is False and R is True.
3. Both A and R are True.
4. Both A and R are False.

Options

• (1)

• (2)

• (3)

• (4)

Answer 1

(2)

Explanation:

Effectors do not receive stimuli and send impulses towards the central nervous system. Effectors are muscles or glands that carry out a response after receiving motor impulses from the central nervous system. Therefore, the Assertion (A) is false.

Specialized sensory or receptor cells in certain organs receive stimuli such as light, sound, heat, pain, and other changes and generate nerve impulses. Therefore, the Reason (R) is true.

Hence, A is false and R is true.