Question

In echinoderms, the nervous system is

• A. Well developed
• B. With large brain
• C. Devoid of brain
• D. Both A and B

Answer 1

The correct option is C Devoid of brain

A) The nervous system is complex, but not very well developed.

B) Echinoderms do not have a central brain.

C) They do not have a brain. Instead, the network of nerves is called nerve plexus. These nerves run under the surface of the skin.

D) The nervous system is not very well developed and brain is absent.

So the correct option is 'devoid of brain'.