Question

Assertion (A): Radial symmetry is an advantage to sessile or slow moving animals.
Reason (R): Radial symmetry allows equal distribution of sense organs and body parts in all directions, facilitating equal response in any direction.
Identify the correct option from the following:

• A. Both (A) and (R) are true, and (R) is correct explanation of (A)
• B. Both (A) and (R) are true, but (R) is not the correct explanation of (A)
• C. (A) is true, but (R) is false
• D. (A) is false, but (R) is true

Hint:

Radial symmetry suits organisms that do not move fast — it enables sensing and responding in all directions equally.

Answer 1

The Correct Option is A

Assertion: True. Radial symmetry helps animals like cnidarians and echinoderms to respond to stimuli from all directions, which is useful for sessile or slow-moving organisms.
Reason: True. Radial symmetry allows sense organs and structures to be evenly distributed around the body, facilitating response in any direction.
Explanation: Since radial symmetry supports survival in a fixed or slow-moving lifestyle by facilitating environmental interaction from all sides, the reason correctly explains the assertion.