Which constraint prevents insect imaginal discs transitioning too early from larva to pupae stage?

💡 Explanation

When the hormone juvenile hormone (JH) surpasses threshold levels, secretion inhibits imaginal discs, maintaining the larval state because high titers postpone pupal differentiation. Therefore JH levels ensure larval maintenance, rather than premature ecdysone, PTTH, or Bursicon action which govern different developmental phases.

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