Which of the following organisms have the nervous system only at a very primitive stage of development?
A
Amoeba
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B
Hydra
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C
Earthworm
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D
Paramecium
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Solution
The correct option is BHydra The primitive form of nervous system is present in the Hydra. There are sensory receptive cells in the tentacles and the other body parts. These sensory cells are connected to the nerve net. This is the network of the nerves which connects all these cells and is responsible for the nervous conduction.