NEETZoologyStructural Organisation in Animals
Read the following statements regarding the abdominal morphology of cockroaches and select the incorrect statement.
Options
- AThe female genital pouch is formed by the 7^ th , 8^ th and 9^ th sternites.
- BIn both sexes, the 10^ th segment bears a pair of jointed filamentous structures called anal cerci.
- CAnal styles are short, thread-like structures that arise from the 10^ th segment in male cockroaches.
- DThe male genital pouch is bounded dorsally by the 9^ th and 10^ th terga and ventrally by the 9^ th sternite.
Correct answer
C. Anal styles are short, thread-like structures that arise from the 10^ th segment in male cockroaches.
Step-by-step solution
The incorrect statement is that anal styles arise from the 10^ th segment. In male cockroaches, the short, thread-like, unjointed anal styles arise from the 9^ th sternite, not the 10^ th segment. The 10^ th segment bears the anal cerci in both males and females. The statements regarding the boundaries of the male genital pouch and the formation of the female genital pouch are anatomically correct as per NCERT. Answer: Anal styles are short, thread-like structures that arise from the 10^ th segment in male cockroac