What external changes are visible after the last moult of a cockroach nymph?
Labium develops
Mandibles become harder
Anal cerci develop
Both fore wings and hind wings develop
As we discussed in
Development in cockroach -
The development of P.americana is paurometabolous (Development through nymphal stage). The lymph 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. Nymph lacks wings
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Cockroach nymph growth by moulting.
Last moulting results in development of wings.
Option 1)
Labium develops
Incorrect Option
Option 2)
Mandibles become harder
Incorrect Option
Option 3)
Anal cerci develop
Incorrect Option
Option 4)
Both fore wings and hind wings develop
Correct Option