Question

Nervous system of echinoderms comprises

• A. Radial nerve cords
• B. Presence of brain
• C. No brain
• D. Chain of ganglia

Answer 1

The correct option is A Radial nerve cords

Nerve net is the arrangement of neurons in the form of net or mesh. This type of nervous system is found in lower organisms. Echinoderms have a simple radial nervous system. The nervous system consists of a modified nerve net which is comprised of interconnecting neurons. There is no central brain. There are certain species which possess ganglia. Nerves radiate from the central rings around the mouth into each arm or along the body wall.
Therefore, the correct answer is option A.