NEET · Biology · STD 11 - 7. Structural organisation in animal

Which of the following is characteristic feature of cockroach regarding sexual dimorphism?

A Presence of anal cerci
B Dark brown body colour and anal cerci
C Presence of anal styles
D Presence of sclerites

Verified Solution

Answer & Solution

Correct Answer

(C) Presence of anal styles

Step-by-step Solution

Detailed explanation

Option (3) is the correct answer because anal styles are present in male cockroaches and absent in female cockroaches.
Option (1), (2) and (4) are not the correct answers because sclerites, anal cerci and dark brown body colour are common features of both male and female cockroaches.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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