Question

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

• A. Boat-shaped 7 th sternum forming brood pouch
• B. Anal style in 9 th abdominal segment
• C. Anal cerci in 10 th abdominal segment
• D. Both (A) and (C)

Answer 1

Answer: (A)

Male cockroach bears a pair of short, thread-like structure in $9^{\text{th }}$ abdominal segment called anal style. In both sexes, the $10^{\text{th }}$ abdominal segment bears a pair of a jointed filamentous structure called anal cerci.
In females, the $7^{\text{th }}$ sternum is boat shaped and together with the $8^{\text{th }}$ and $9^{\text{th }}$ sterna forms a brood or genital pouch whose anterior part contains female gonopore, spermathecal pores and collateral glands.