Question

Assertion (A): Some adult gastropods (e.g., snail) are asymmetrical.
Reason (R): Torsion takes place during the development of gastropods.

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

Hint:

Torsion in gastropods is a 180-degree twisting of the body, leading to asymmetry in adults.

Answer 1

The Correct Option is A

Step 1: Understanding Gastropod Development

- Gastropods undergo torsion, where the visceral mass twists during larval development, making them asymmetrical as adults.
- Since torsion explains asymmetry, (R) is the correct explanation of (A).