Final answer:
Juvenile hormone levels in mature caterpillars decrease, triggering the transition from larval to pupal stages.
Explanation:
Juvenile hormone, secreted by the corpora allata, plays a crucial role in maintaining the juvenile stages of insects. When juveniles have high levels of this hormone, they remain immature. However, as JH levels decrease in the mature caterpillar, it triggers the transition from the larval to the pupal stage due to the absence of JH.
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