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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a
Both A and R are true and R is the 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
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.