Read the following statements related with nervous system of cockroach.
1. The nervous system of cockroach consists of a series of fused, segmentally arranged ganglia joined by paired longitudinal connectives on the ventral side.
2. Three ganglia lie in the thorax, and six in the abdomen.
3. The nervous system of cockroach is spread throughout the body.
In the above statements, how many are incorrect?

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answer is D.

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Detailed Solution

All are correct.
1. The nervous system of cockroach consists of a series of fused, segmentally arranged ganglia joined by paired longitudinal connectives on the ventral side.
2. Three ganglia lie in the thorax, and six in the abdomen.
3. The nervous system of cockroach is spread throughout the body.

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