Question

Which of the following statements is correct about cockroach?

• A. In females, the 6^th sternum is boat-shaped and together with the 7^th and 8^th sterna form a brood or genital pouch
• B. In males, the genital pouch is bounded dorsally by 9^th and 10^th sterna and ventrally by the 9^th tergum
• C. Females bear a pair of short, threadlike anal styles which are absent in males
• D. The 10^th segment has a pair of filamentous structures called anal cerci

Answer 1

Answer: (D)

In cockroach, both males and females have 10 abdominal segments. In females, the genital pouch is made up of 7^th, 8^th and 9^th abdominal sterna. Out of this, 7^th sternum is boat-shaped. In male cockroaches, the genital pouch is bound by the 9^th abdominal sternum on the ventral side and 9^th and 10^th terga on the dorsal side. Anal styles are a pair of short structures found only in males. They are absent in females. Anal cerci are a pair of filamentous structures found in the 10^th abdominal segment of both males and females.