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Hydra's nervous system is just a network of neurons. Insects are better organised because they have a:
ABrain with ganglia
BLong spinal cord
CLarge cerebellum
DBony backbone
Answer & Solution
Correct answer: A. Brain with ganglia
1. Lower invertebrates have only a nerve net.
2. Insects add a brain and several ganglia.
3. So insects have a brain with ganglia.
_Source: NCERT Class 11 Biology, Chapter 21, Neural Control and Coordination._
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