First slide

Classification of Animals

Question

Which of the following are radially symmetrical?

Easy

A

Echinoderm larvae
B

Roundworms
C

Earthworms
D

Coelenterates

Solution

Coelenterates (cnidarians and ctenophores) are radially symmetrical. Any plane passing through the central axis of the body divides the organism into two identical halves. Echinoderm larvae are bilaterally symmetrical; adults are radially symmetrical. Roundworms (Aschelminthes) and earthworms (Annelida) are bilaterally symmetrical

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