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Q.

Male and female cockroaches can be distinguished externally by

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a

anal cerci in female

b

anal styles and antennae in female

c

anal styles in male

d

anal cerci, anal styles and antennae in female

answer is A.

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Detailed Solution

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Males bear a pair of short, thread-like anal styles which are absent in females. In both sexes, the 10th segment bears a pair of jointed filamentous structures called anal cerci. Antennae are present in both males and females.

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