Q.

The double ventral nerve cord of cockroach bears

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a

six ganglia in the thorax and six ganglia in the abdomen

b

three ganglia in the thorax and three ganglia in the abdomen

c

three ganglia in the thorax and six ganglia in the abdomen

d

three ganglia in the head and six ganglia in the thorax

answer is D.

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Detailed Solution

The nervous system of cockroach consists of a series of fused, segmentally arranged ganglia joined by paired longitudinal connectives on the ventral side. Three ganglia lie in the thorax, and six in the abdomen.

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