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

Pheretima

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Hydra

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Amoeba

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Periplaneta

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Solution

The correct option is B Hydra
The nervous system is absent in Porifera. In Coelenterates nerve cells are present but not organised into a nervous system. In Hydrozoan Cnidarian like Hydra, nerve cells associate to form a nerve net but a well-organised brain is absent.

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