Question

An animal having unsegmented coelom, superficial radial symmetry in adult but bilateral symmetry in larva is a member of

• A. Mollusca
• B. Echinodermata
• C. Arthropoda
• D. Annelida

Answer 1

The correct option is B Echinodermata

A) Molluscans are unsegmented, are bilaterally symmetrical as larva and asymmetrical as adults.

B) Echinodermata members are unsegmented, have bilaterally symmetrical larva and are radially symmetrical as adults.

C) Arthropods are segmented and have bilateral symmetry in both adult and larval stages.
D) Annelids are segmented and have bilateral symmetry in both adult and larval stages.

So the correct answer is 'Echinodermata'