Which of the following is the only gaseous plant growth regulator?

 

Question: Which of the following is the only gaseous plant growth regulator?

Ethylene is the only gaseous plant growth regulator. It is produced naturally by plants in response to stress, such as during fruit ripening, leaf senescence, and flower wilting. Ethylene also plays a role in the coordination of plant growth and development, including the regulation of cell elongation and the formation of adventitious roots. Additionally, ethylene is widely used in agriculture to control the ripening of fruits and vegetables and to promote the flowering of ornamental plants.

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