Question

Anal style is present in
(a) male cockroach
(b) female cockroach
(c) both the sexes
(d) none of these

Answer 1

Hint: The copulatory organ that is present in the 9th segment of the abdomen in the cockroach. They are unjointed structures. Gentle aperture is present in the segment just below the segment where male copulatory organs are present.

Complete answer:
In cockroaches, the abdomen is divided into 10 segments. In 10 segments it contains 10 terga and 9 sterna.
The posterior end of the abdomen has a pair of anal cerci, anal styles, and gonopophyses in males. Anal cerci arise from the lateral side of the 10th segment and they are found in both males and females whereas anal styles that arise from the ninth segment are found only in males and are absent in females.

Additional Information:
-The body of a cockroach is divided into three morphologically distinct parts called the head, thorax, and abdomen
- The morphologically distinct parts of a body is called tagmata
-The head of a cockroach is formed by the fusion of 6 embryonic segments, the thorax contains 3 segments, and the abdomen is divided into 10 segments
-Each segment of the abdomen is covered by the dorsal tergum, ventral sternum, and two lateral pleura.
- Due to the overlapping of the 7th segment, 8th tergum in male, 8th and 9th terga in females are not visible.
-9 sterna are visible in males and only 7 sterna are visible in the female as 7th 8th 9th sterna together form into the brood pouch
-A pair of anal cerci, anal styles, and gonopophyses are present in the posterior end of the abdomen
-Anal styles without joints arise from the 9th segment of the abdomen that is found only in males
So, the correct answer is ‘male cockroach’

Note: The anus is present at the posterior end of the abdomen in the 10th segment. The genital aperture in male is present in the 10th segment just below the anus. In females, the genital aperture is present in the 8th sternum.
The scientific name of cockroach is ‘Periplaneta americana’.