Gaseous growth hormone is

IAA

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Kinetin

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Ethylene

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Solution

The correct option is D Ethylene
Ethylene is the only gaseous plant hormone. It is also called as ripening hormone as it plays the important role in controlling the fruit ripening. During fruits ripening, the respiration rate in fruits is increased by ethylene. Due to increased respiration, complex carbohydrates are broken down into simpler sugars and cell wall becomes soft. It inhibits cell division. It is also involved in abscission of leaves, fruits and flowers.
Thus, the correct answer is option D.

Suggest Corrections

Plant Hormone	Functions
1. Auxin	Helps in the growth of plant tissue.
2. Cytokinin	Promotes cell division, delays aging of cells.
3. Ethylene	Inhibits growth and causes wilting of leaves, promoting dormancy of buds.
4. Gibberellin	This is a gaseous hormone that causes the ripening of fruits