____________ is the only gaseous natural plant hormone.

Auxin

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Gibberellins

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Ethylene

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Cytokinins

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Solution

The correct option is C Ethylene
It acts as a growth promoter as well as an inhibitor. Occurs in gaseous form. It is synthesised in the ripening fruits and tissues undergoing senescence. It regulates many physiological processes and one of the most widely used hormones in agriculture.

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Ethylene is a gaseous plant hormone released outside the plant body.

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