Question

Among the following, simplest neural organisation consisting of a network of neurons but lacking brain or ganglia is seen in
0 Periplaneta
Pila
0 Hydra
KO Hyla
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Answer 1

Answer : Hydra

Explanation :-

1. Periplaneta americana : Arthropoda : CNS is represented by nerve ring and 2 nerve cords having paired ganglion like Annelida.

2. Pila : Mollusca : Nervous system is scattered in head region called the cerebral ganglion, visceral ganglion, pedal ganglion and 2 nerve cords are also present.

3. Hydra : Coelentrata : First nervous system, apolar neurons, no neurites.

4. Hyla : Vertebrata : CNS and PNS → Well developed, cranial nerve in amphibia are 10 pairs ( 20 in number ).

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