What external changes are visible after the last moult of a cockroach nymph _________________.
Labium develops
Mandible becomes harder
Anal cerci develop
Both fore wings and hind wings develop
A
Labium develops
B
Both fore wings and hind wings develop
C
Mandible becomes harder
D
Anal cerci develop
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Solution
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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 wings. Anal cerci are a pair of jointed filamentous structures in the 10th segment of both sexes. The labium is a lower lip and a pair of mandibles are present in mouthparts of a cockroach.
So, the correct answer is 'Both fore wings and hind wings develop'.
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