Question

In Cockroach, nymphal characters are maintained by

• A. Ecdysone
• B. Salivary glands
• C. Parotid gland
• D. Juvenile hormone

Answer 1

Answer: (A), (D)

The correct options are
A Ecdysone
D Juvenile hormone

Nymph of cockroach emerges out from ootheca. A nymph resembles to adult in general structure but lacks the wings and mature reproductive organs.

Instar a large stage in the development of insects.

In Periplaneta americana, the nymph grows by molting about 13 times to reach the adult form. Blatta orientalis molts 6 times.

Metamorphosis is regulated by two hormones, ecdysone secreted by prothoracic glands and juvenile hormone secreted by corpora allata.

So the correct answer is 'Juvenile hormone and ecdysone'.