Question
Explain the hormonal control and regulation of insect development by JH, PTTH and ecdysone hormone.
Answer :
Word Count : 453
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In insects, development and metamorphosis are tightly regulated by hormones, which coordinate growth, molting, and the transition from one life stage to another. Among the key hormones involved are Juvenile Hormone (JH), Prothoracicotropic Hormone (PTTH), and ecdysone. These hormones interact in a precise sequence to ensure that insect development proceeds correctly, from larval stages through pupation to adult emergence. Juvenile Hormone, produced by the corpora allata, plays a critical role in maintaining larval characteristics during development. High levels of JH during molting ensure that the insect molts into another larval instar rather than progressing to pupal or adult stages. Essentially, JH acts as a “status quo” hormone, preventing premature metamorphosis. The concentration of JH declines as the insect reaches its final larval instar, allowing the transition to pupal and adult stages. This hormone also influences other physiological processes, including reproduction, diapause, and the development of
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