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Metamorphosis of insects is regulated through hormone

1. pheromone
2. thyroxine
3. ecdysone
4. all the above

Correct answer: ecdysone

Solution

Ecdysone is the key insect hormone that initiates molting and metamorphosis. Pheromones are communication chemicals, and thyroxine is a vertebrate thyroid hormone, so neither regulates insect metamorphosis here.

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