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Organisation of the PNS

In which anim...

Question

In which animal nerve cell is present but brain is absent?

A

Sponge

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B

Earthworm

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C

Cockroach

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D

Hydra

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Solution

The correct option is D Hydra
Hydra is a genus of small, simple, fresh-water animals that possess radial symmetry. It is solitary, sessile and fresh water form. Nervous system is diffused and neurons are apolar but brain is absent.
Therefore, the correct answer is option D.

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