Assertion (A): Torsion in gastropods improves their defense mechanism. Reason (R): The repositioning of the mantle cavity allows…

Question

Assertion (A): Torsion in gastropods improves their defense mechanism.

Reason (R): The repositioning of the mantle cavity allows the head to retract into the shell before the foot.

1. A. Both A and R are true, and R is the correct explanation of A. (Correct answer)
2. B. Both A and R are true, but R is not the correct explanation of A.
3. C. A is true, but R is false.
4. D. A is false, but R is true

Correct Answer

Option A — Both A and R are true, and R is the correct explanation of A.

Detailed Solution & Explanation

The correct answer is Both A and R are true, and R is the correct explanation of A..

Key Points

• Torsion in gastropods does improve defense (A is true).
• The repositioning of the mantle cavity to the front allows the head to withdraw into the shell first, providing better protection - R correctly explains A.