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Control and Co-ordination — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYControl and Co-ordination5 Marks
Question
Nervous system of Hydra.
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Answer

  1. Hydra, a cnidarian shows the diffused nervous system in the form of nerve net.
  2. It is the most primitive nervous system.
  3. There are two nerve nets in the mesoglea-one connected towards the epidermis and second towards the gastro-dermis.
  4. Hydra lacks sensory organs, but the sensory cells scattered in the body wall.
  5. The nerve impulse shows no polarity or direction. As all neurons are interconnected the response is seen throughout the body.

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