Which of the following features is used ...

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

Forewings with darker tegmina

Presence of caudal styles

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

Presence of anal cerci

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Which of the following structure is present only in male cockroach?

Anal cerci, pair of jointed filamentous structure which arise from `10^(th)` segment

a pair of short thread like anal styles

Arthrodial membrane

Chitinous exoskeleton

and cerci

long wing

Both (a) and (b)

anal style

Body divisible into head, thorax and abdomen

Two pairs of wings are found

Three pairs of jointed legs are present on abdomen

Pressence of anal cerci in both sexes.