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Q.

Which of the following is not a characteristic feature of phylum Mollusca?

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a

It is the second largest animal phylum.

b

In all molluscs the mouth contains a rasping organ.

c

They are usually dioecious and oviparous with indirect development.

d

Body is covered by a calcareous shell and they are unsegmented.

answer is B.

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Detailed Solution

Radula is the rasping organ absent in bivalves of Mollusca.

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Which of the following is not a characteristic feature of phylum Mollusca?