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Q.

File-like rasping organ in molluscs is 

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a

ctenidium

b

osphradium

c

radula

d

stomochord

answer is A.

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Detailed Solution

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The mouth of molluscs contains a file-like rasping organ for feeding, called radula. 

Ctenidia are the gills of molluscs. 

Osphardium is a sense organ in the mantle cavity of molluscs; It detects the purity of water entering the mantle cavity. 

Stomochord is present in hemichordates.

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