Which outcome occurs due to insufficient ecdysone during the late pupal stage in holometabolous insects?

💡 Explanation

When molting hormone (ecdysone) is deficient during the late pupal stage, the hormonal signal for initiating cuticle formation is absent because the signal requires a certain concentration to bind to receptors, thus preventing the pupa from beginning metamorphosis into the adult form and leading to it never forming an adult cuticle. Therefore, failure to initiate adult cuticle formation results, rather than premature emergence, melanization defects, or disrupted larval degradation; these depend on different molecular pathways.

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