Which outcome occurs when a lepidopteran larva experiences insufficient ecdysone during a critical instar stage?

💡 Explanation

When ecdysone (molting hormone) levels are insufficient in larva, the proper genetic cascade cannot be activated, arresting larval development because specific gene expression requires hormonal trigger, preventing progression into pupal/adult stages. Therefore developmental arrest results, instead of reduced pupation, accelerated molting, or enhanced immunity which rely on different hormonal balances.

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