Question

Which feature is shown by coelenterates?

I. Acoelomate
II. Radial symmetry
III. Development of a head

• A. I only
• B. II only
• C. III only
• D. I and II only
• E. I, II and III

Answer 1

The correct option is D I and II only

Radial symmetry is the symmetry about a central axis where the organism is divided into equal halves by any plane.

Coelenterata consists two phylum Ctenophora (comb jellies) and the Cnidaria (coral animals, true jellies, sea anemones, sea pens, and their allies). They are radially symmetrical, diploblastic. These animals are acoelomates and they do not possess a head. Hence, the correct answer is the option D.