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

  • Option 1)

    Labium develops

  • Option 2)

    Mandibles become harder

  • Option 3)

    Anal cerci develop

  • Option 4)

    Both fore wings and hind wings develop

 

Answers (1)

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

-

 

 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

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