Visceral mass undergo torsion in which of the following class?

Gastropoda

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Cephalopoda

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Palacopoda

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None of the above

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Solution

The correct option is A Gastropoda
The gastropods possess an asymmetrical body. Torsion is the rotation of the visceral mass, mantle and shell 180 degree with respect to the head and foot of the gastropod. This brings the mantle cavity and anus to an anterior position above the head, thereby causing asymmetry in gastropods. Thus, the correct answer is option A.

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