Which one of the following is gaseous growth regulator?

IAA

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NAA

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IBA

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Ethylene

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Solution

The correct option is D Ethylene
Ethylene is a gaseous plant hormone that act as growth regulator. It inhibits plant growth. It is also called as ripening hormone. It is responsible for ripening of fruits. Fruit ripening is accompanied by increased rate of respiration. Ethylene in gaseous form is used to accelerate the process of ripening of fruits.
Thus, the correct answer is option D.

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