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

What external changes are visible after the last moult of a cockroach nymph?

A Both forewings and hindwings develop
B Labium develops
C Mandibles become harder
D Anal cerci develop

Verified Solution

Answer & Solution

Correct Answer

(A) Both forewings and hindwings develop

Step-by-step Solution

Detailed explanation

(a) : Cockroach undergoes paurometabolous development. The nymph moults about \(6-7\) times to reach the adult form. The next to last nymphal stage has wing pads but onlyadult cockroaches have wings.

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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