Assertion (A) : Open circulatory system is found in all molluscs.Reason (R) : In all molluscs, haemolymph directly bathes the internal tissues and organs.

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

Both A and R are true, but R is not the correct explanation of A.

A is true, but R is false.

Both A and R are false.

answer is D.

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Detailed Solution

Not all molluscs have open circulatory system. Cephalopods have a closed circulatory system.

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