Question

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

• A. Absence of head
• B. Absence of gills
• C. Tentacles around the mouth
• D. Presence of coiled shell

Answer 1

The correct option is A Absence of head

Bivalvia comprises a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. They have no head and they also lack a radula. Bivalves include oysters, clams, cockles, mussels etc.

So, the correct answer is option A.