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

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Both fore wings and hind wings develop

Labium develops

Mandibles become harder

Anal cerci develop.

answer is A.

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Detailed Solution

In Periplaneta americana, the nymph grows by moulting about 13 times to reach the adult form. The next to last nymphal stage has wing pads but only adult cockroaches have wings.

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