Question

Read the given statements and select the incorrect one.

• A. In Hydra, all neurons are similar and join to form a nerve net.
• B. In Earthworms, the nervous system consists of a dorsal nerve cord, paired ganglia, and segmental nerves.
• C. Brain is present in insects
• D. Planaria has two nerve cords that join to form rudimentary brain

Answer 1

The correct option is B In Earthworms, the nervous system consists of a dorsal nerve cord, paired ganglia, and segmental nerves.

Earthworm's brains consist of a pair of cerebral ganglia, ventral nerve, and segmental nerves. The nervous system of the earthworm is segmented just like the rest of the body. Other statements of this question are correct, only statement b is incorrect.

So, the answer is option B.