Which developmental effect occurs when an insecticide disrupts ecdysone signaling within imaginal discs in fly larvae?

💡 Explanation

When insecticide disrupts ecdysone signaling, the disrupted hormonal regulation interferes with the activation of genes required for differentiation in the imaginal discs because proper ecdysone signaling is essential for initiating metamorphosis. Therefore, metamorphic arrest results, rather than accelerated molting, suppressed melanization or enhanced resistance, which are dependent on separate signaling pathways.

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