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Q.

A file-like rasping organ called radula is present in the buccal cavity of 

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a

sea walnut

b

brittle star

c

apple snail

d

king crab

answer is C.

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Detailed Solution

Apple snail (Mollusca) has a file-like rasping organ called radula in its oral cavity.

Sea walnut (Ctenophora), brittle star (Echinodermata) and king crab (Arthropoda) lack radula.

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