Which of the following is a distinctive character of class Bivalvia of the phylum Mollusca?

Absence of head

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Presence of arms or tentacles around the mouth

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Absence of gills

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Presence of a coiled shell

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Solution

The correct option is A Absence of head
Bivalvia is a class of Mollusca. This is the class where the members are characterized by having a shell. The shell is composed of right and left halves. Bivalves lack a head. There is no proper cranium. The organisms also do not have radula and jaws.
Thus, the correct answer is option A.

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