Animal Kingdom Question 19
Question: Which one of the following animals possesses nerve cells but no nerves?
Options:
A) Hydra
B) Tapeworm
C) Earthworm
D) Planaria
Show Answer
Answer:
Correct Answer: A
Solution:
Hydra (phylum Cnidaria) possesses individual nerve cells (neurons) that form a diffuse nerve net spread throughout the body. Unlike higher animals, these nerve cells are not organised into definite nerves (nerve cords or nerve bundles). The nerve net is one of the simplest forms of nervous system organisation in the animal kingdom. Tapeworm, Earthworm, and Planaria all possess organised nerve cords or nerve bundles in addition to individual nerve cells. Hence, the correct answer is Hydra.
BETA
