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Question

Which of the following is incorrect about Periplaneta americana?
  1. The nymph undergoes moulting almost 10 times to become an adult
  2. Fertilized eggs are encased in ootheca
  3. Food is ground by mandibles and gizzard
  4. Anterior aorta is the single large blood vessel


Solution

The correct option is A The nymph undergoes moulting almost 10 times to become an adult
The development of P. americana is paurometabolous. Here the development is through nymphal stage. The nymphs look very much like adults. The nymph grows by moulting upto 13 times to reach the adult form. 

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