Question

Anal styles are found in
A. Housefly
B. Female cockroach
C. Male cockroach
D. Both male and female cockroach

Answer 1

Hint: These are a pair of appendages which is the sternum of cockroaches and it helps them to move in the opposite direction too. Pair of anal style are found in the 9th segment.

Complete answer:
First of all, you should know what is Anal style. Anal styles are a pair of thread like appendages which arise from the 9th segment of the male cockroaches. These are features of male arthropods and this helps in copulation in them. Now let's look at options.

> Option A: Housefly are polygynous in nature which means that male mates with multiple females, they initiate copulation by jumping on female when sitting or by knocking himself into her which takes 30-120 minutes to mate only if the female allows. Female house fly lays her egg in feces after a day. In, housefly there is no anal styles seen for copulation and these are found in cockroaches and due to which this option seems incorrect and this gets eliminated.

> Option B: Female cockroach, so in order to mate male cockroaches have to make females into the mating position, females don't lure males. Males lure females by secreting a sugar-rich substance from a gland in their abdomen. Anal style is not found in female cockroaches since it is present at the 9th segment on male cockroaches, therefore this is absent in female cockroaches and thus this option is incorrect one and it gets eliminated.

> Option C: Male cockroach. They have anal styles which are un-jointed paired structures found in the 9th segment and it is sternum of male cockroaches which help them in copulation. This is the feature of male cockroaches. Anal styles sense that something is coming from cockroaches back and due to this, it helps them to run in the opposite direction too. Therefore, this option is the correct one.

> Option D: Both male and female cockroaches. Since female cockroaches do not have anal styles but the male cockroaches have anal styles and therefore this cannot be the correct option since both female and male cockroaches do not have anal styles only males have anal style. Therefore, this option is incorrect and it gets eliminated.

Hence, the correct answer is option (C).

Note: Anal styles are a pair of thread like appendages which arise from the 9th segment of the male cockroaches which helps in copulation. Male cockroaches lure females and they initiate copulation by jumping on the female when sitting or by knocking himself into her.