Which of the following animals has a nervous system but no brain?

Earthworm

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Hydra

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Amoeba

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Cockroach

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Solution

The correct option is B Hydra
The nervous system in hydra is made up of nerve cells joined and spread in its whole body in the form of a network. This network of nerve cells connect sensory photoreceptors and touch sensitive nerve cells present in the tentacles that help in adjusting to the environment. It does not have a brain. Thus the correct answer is option B.

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