What external changes are visible after the last moult of a...

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

Options

AMandibles become harder
BAnal cerci develop
CBoth fore wings and hind wings develop
DLabium develops

Correct answer

C. Both fore wings and hind wings develop

Step-by-step solution

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 10th segment of both sexes. Labium is a lover lip and a pair of mandibles are present in mouthparts of cockroach.

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