Question

Which of the following hormones regular growth and metamorphosis in insect?

• A. Ecdyson
• B. Brain hormone
• C. Juvenile hormone
• D. Prothoracicotropic hormon

Answer 1

The correct option is A Ecdyson

Metamorphosis is the series of changes in the life of an insect where it changes from the larva to the adult form. Ecdysis or molting is the periodic shedding of the old exoskeleton. The form of the developing insect between two molts is called instar.

There are various hormones that regulate metamorphosis. Some of them are-

1. Prothoracicotropic (PTTH) or brain hormone that signals the prothoracic cells to secrete molting hormone.

2. Ecdyson- This is secreted by the prothoracic gland. The hormone stimu­lates growth and initiates the process of molting and shedding the old cuticle of the larva and the new cuticle is formed beneath the old cuticle.

3. juvenile hormone (JH)- The juvenile hormone keeps the larval cells active and also controls the qualitative changes in the body during metamorphosis.

So, the correct option is 'Ecdyson'