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Which of the following is characteristic feature of cockroach regarding sexual dimorphism?
Dark brown body colour and anal cerci
Presence of anal styles
Presence of sclerites
Presence of anal cerci
Answers (1)
The correct answer is Option 2) Presence of anal styles.
Sexual dimorphism refers to the differences in physical characteristics between males and females of a species. In the case of cockroaches, one characteristic feature of sexual dimorphism is the presence of anal styles in males.
Anal styles are specialized structures located at the posterior end of the abdomen in male cockroaches. They are small, finger-like projections that are used during mating. These structures help in the transfer of sperm from the male to the female during copulation.
On the other hand, option 1) Dark brown body color and anal cerci are not specifically related to sexual dimorphism in cockroaches. Both males and females of many cockroach species can have a dark brown body color and anal cerci, which are sensory appendages located at the posterior end of the abdomen.
Option 3) Presence of sclerites refers to the hardened plates or structures that form the exoskeleton of cockroaches. While there may be slight differences in sclerites between male and female cockroaches, it is not a characteristic feature of sexual dimorphism.
Therefore, the correct answer is Option 2) Presence of anal styles.
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