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

Options

A. Forewings with darker tegmina
B. Presence of caudal styles
C. Presence of a boat-shaped sternum on the 9th abdominal segment
D. Presence of anal cerci

Answer

B

Explanation

In male cockroach, the `9^(th)` sternite bears a pair of sn~all and spine-like unjointed caudal or anal styles which are absent in female cockroach. The anal styles are believed to functiou as 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.