Q.

How many abdominal ganglia are present in cockroach?

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a

Three

b

Six

c

Nine

d

Ten

answer is B.

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Detailed Solution

In cockroach, the double ventral nerve cord emerges out from circumoesophageal nerve ring. It is provided with three thoracic ganglia and six abdominal ganglia. The abdominal ganglia are located in 1, 2, 3, 4, 6 and 7 abdominal segments.

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