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Question
Which of the following animals has a nervous system but no brain?
- Earthworm
- Hydra
- Amoeba
- Cockroach
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Solution
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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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