Which hormonal mechanism regulates metamorphosis timing in lepidopteran insects experiencing nutritional stress?

💡 Explanation

When lepidopteran larvae experience nutritional stress, Juvenile Hormone (JH) secretion is elevated, because this ensures continued feeding and growth to reach critical size before pupating, delaying metamorphosis. Therefore maintaining larval stage occurs, rather than premature pupation or molting which is otherwise promoted at reduced JH levels.

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