Question

Male cockroach and female cockroach can be differentiated by

• A. ocelli
• B. anal cerci
• C. anal styles
• D. both

Answer 1

Answer: (C)

anal styles

Answer 2

Cockroach is dioecious i.e., the sexes are separate. Sexual dimorphism is evident in the internal reproductive organs as well as external morphology. Male cockroach and female cockroach can be differentiated by the presence of anal styles. Anal styles is present in male cockroach as a pair of short, unjointed thread like, structure on 9th sternum, in addition to anal cerci. 7th tergum 10th tergum Anal cercus Anal style 7th tergum 10th tergum Anal cercus Male (Dorsal view)Female(Dorsal view) Fig. P. americana. Posterior segments of the abdomen.