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Q.

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

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a

Both fore wings and hind wings develop

b

Labium develops

c

Mandibles become harder

d

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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