Question

Radial symmetry is not followed by

• A. Coelenterates
• B. Arthropods
• C. Ctenophores
• D. Echinoderms

Answer 1

The correct option is B Arthropods

Sponges are mostly asymmetrical, i.e., any plane that passes through the centre does not divide them into equal halves. When any plane passing through the central axis ofthe body divides the organism into two identical halves, it is called radial symmetry. Coelenterates, ctenophores and echinoderms have this kind of body plan. Animals like annelids, arthropods, etc., where the body can be divided into identical left and right halves in only one plane, exhibit bilateralsymmetry.