Question

Assertion (A): Semi-circular canals are present in the middle ear and they contain sensory cells responsible for the static balance of the body. 

Reason (R): One end of each of the three semicircular canals is widened to form an ampulla which contains the sensory cells for dynamic balance.

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:

The semicircular canals are present in the inner ear, not the middle ear. They are mainly concerned with dynamic balance, not static balance. Therefore, the Assertion (A) is false.

One end of each semicircular canal is enlarged to form an ampulla, which contains sensory cells that help maintain dynamic balance during movements of the head. Therefore, the Reason (R) is true.

Hence, A is false and R is true.