Which of the following features is used to identify a male cockroach from a female cockroach?

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Presence of caudal styles

Forewings with darker tegmina

Presence of a boat-shaped sternum on the 9^th abdominal segment

Presence of anal cerci

answer is B.

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Detailed Solution

Males bear a pair of short, thread like anal styles (caudal styles) arising from the 9^th sternum which are absent in females.

7^th sternum is boat shaped and together with the 8^th and 9^th sterna forms a brood or genital pouch in female cockroaches.

Forewings with darker tegmina and anal cerci are present in both male and female cockroaches.

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