Which of these is not a plant growth promoter?

Auxin

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Cytokinins

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Ethylene

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Gibberellins

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Solution

The correct option is C Ethylene
Plants hormones are also called phytohormones. There are five main types of growth regulators, which can be classified as plant growth promoters and plant growth inhibitors. Auxins, Gibberellins and Cytokinins are the examples of plant growth promoters. Abscisic acid and Ethylene are known as plant growth inhibitors.

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