Q.

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 but (R) is not the correct explanation of (A)

b

Both (A) and (R) are true and (R) is the correct explanation of (A)

c

Both (A) and (R) are false

d

(A) is true but (R) is false

answer is A.

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Detailed Solution

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

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