Which of the following features is used to identify a male cockroach from a female cockroach ?
Which of the following features is used to identify a male cockroach from a female cockroach ?
(1) Presence of a boat shaped sternum on the 9th abdominal segment
(2) Presence of caudal styles
(3) Forewings with darker tegmina
(4) Presence of anal cerci
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The correct option is(2) Presence of caudal styles
Explanation:
In male cockroach, the 9th sternite bears a pair of small and spine-like unjointed caudal or anal styles which are absent in female cockroach. The anal styles are believed to function as a motion detector.
Besides this, the other three characters, i.e. anal cerci, boat-shaped sternum on 9th abdominal segment and forewings with darker tegmina are found in both male and female cockroaches.
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