Question

Name the hormone responsible for development of caterpillar to moth
(A)Juvenile hormone(JH)
(B)Adrenaline
(C)Thyroid hormone
(D)Prothoracicotropic hormone(PTTH)

Answer 1

Portland, Maine Researchers have identified a "starter hormone" responsible for initiating the process by which caterpillars transform themselves into moths

Complete answer:
Let’s discuss the options and find out the correct answer
-Juvenile hormone(JH)-The main role of JH in immature insects is to inhibit the genes that promote development of adult characteristics, causing the insect to remain as nymph or larva. During the last larval or nymphal instar, the corpora allatum becomes atrophied and stops producing juvenile hormone.This option is incorrect.
-Adrenaline-Key actions of adrenaline include increasing the heart rate, increasing blood pressure, expanding the air passages of the lungs, enlarging the pupil in the eye (see photo), redistributing blood to the muscles and altering the body's metabolism, so as to maximise blood glucose levels (primarily for the brain).This option is incorrect.
-Thyroid hormone-The thyroid gland is an important hormone gland which plays a major role in the metabolism and growth and development of the human body. .This option is incorrect.
-Prothoracicotropic hormone(PTTH)-In the brain of the larva Prothoracicotropic hormone (PTTH) is secreted by cells present in it. A steroid hormone helps in stimulating moulting and metamorphosis by regulating the production and release of ecdysone. Hence,for its development of the caterpillar to moth which is importantly what metamorphosis is about requires PTTH.This option is correct.
Hence the option D is correct.

Note: -The time taken to turn caterpillars to moths is that Butterflies make chrysalis, while other insects like the tobacco hornworm caterpillar make a cocoon and become a moth. They will live and transform themselves over a period of time into a butterfly or a moth. Nearly many butterflies and moths stay inside for between five to 21 days. of their chrysalis or cocoon.