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

Mandibles become harder

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Anal cerci develop

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Both fore wings and hind wings develop

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Labium develops

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Solution

The correct option is C Both fore wings and hind wings develop
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 only adult cockroaches have wings.

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