Question

The basis of classification of phylum Mollusca is

• A. Morphology
• B. Respiratory organs
• C. Both A and B
• D. Shell

Answer 1

The correct option is D Shell

The phylum mollusc is classified mainly on the basis of the shell structure or the structure of radula. The shell is the outer hard calcareous exoskeleton present in these organisms. The radula is the part of the mouth which helps in feeding. Mollusc are classified into seven classes like gastropoda (single shelled cowries, cones etc), Bivalvia (two shelled like clams, mussels etc), scaphopoda (like tusk shells) etc.

Thus, the correct answer is option D.