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Question

Closed type of blood vascular system is found in which class of mollusca?

A
Cephalopoda
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B
Pelecypoda
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C
Scaphopoda
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D
Monoplacophora
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Solution

The correct option is A Cephalopoda
Cephalopods are marine animals are characterised by bilateral body symmetry, a prominent head, and a set of arms or tentacles modified from the primitive molluscan foot. Octopuses, squids and cuttlefish are common examples of cephalopods. Cephalopods are the only molluscs with a closed circulatory system. So, the correct answer is option A.

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