ZoologyWhich of the following has the most simple nervous organisation?

Which of the following has the most simple nervous organisation?

  1. A

    Apis

  2. B

    Hydra

  3. C

    Asterias

  4. D

    Hirudinaria

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    Solution:

    The neural organisation is very simple in lower invertebrates. Hydra it is composed of a network of neurons. The neural system is better organised in insects (Apis) , where a brain is present along with a number of ganglia and neural tissues. Hirudinaria (Annelida) has a double ventral nerve cord with segmental ganglia. Asterias (Echinodermata) has a nerve ring and radial nerves. The vertebrates have a more developed neural system.

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