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Q.

A female cockroach can be differentiated from a male cockroach, due to the presence of

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a

boat-shaped 7th sternum forming brood pouch

b

anal style in 9th abdominal segment 

c

anal cerci in 10th abdominal segment

d

only 9 abdominal segments

answer is A.

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Detailed Solution

In females, the 7th sternum is boat shaped and together with the 8th and 9th sterna forms a brood or genital pouch.

The abdomen in both males and females consists of 10 segments.

In both sexes, the 10th segment bears a pair of jointed filamentous structures called anal cerci.

Males bear a pair of short, threadlike anal styles which are absent in females.

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