Question

An animal phylum having radially symmetrical adults, but bilaterally symmetrical larvae is:

• A. Porifera
• B. Coelenterata
• C. Echinodermata
• D. Annelida

Answer 1

The correct option is C Echinodermata

• The members of the phylum Echinodermata are bilateral symmetry at the larval stage, but this is lost during metamorphosis when their bodies are reorganised and develop the radial symmetry at the adult stage.
• Coelenterates have radial symmetry.
• Annelids have bilateral symmetry throughout the life stages.
• Porifera do not possess defined symmetry like other animals and hence are classified as asymmetric.

So, the correct answer is option C.