Animal Kingdom Question 695
Question: Which one of the following animals possesses nerve cells but no nerves
[CBSE PMT 1993, 2002]
Options:
A) Hydra
B) Tapeworm
C) Earthworm
D) Frog?s tadpole
Show Answer
Answer:
Correct Answer: A
Solution:
Hydra has nerve cells/ganglion cells that are small or elongated having one or more processes.
Even though Hydra has a system of cells specialized for sensory responses such as touch and chemical responses it does not have a well developed system of nerves that are connected.
Instead it has a system of nerve nets that are spread throughout the body and is a simpler organisation.
BETA
