What external changes are visible after the last moult 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
In cockroach, development is pauro metabolous. 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.
Anal cerci are a pair of jointed filamentous structures in the 10th segment of both sexes. The labium is lower lip present in the mouthparts of a cockroach.
So, the correct answer is option 'c'.

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