First slide

Classification of Animals

Question

Nerve cells are absent in

Easy

A

flatworms
B

coelenterates
C

sponges
D

echinoderms

Solution

Nerve cells are absent in sponges.
Coelenterates have primitive apolar neurons.
Flatworms have ladder-like nervous system.
Echinoderms have a nerve ring and radial nerves.

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