Plant hormones are

Growth regulators

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Growth promoters

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Growth inhibitors

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All of these

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Solution

The correct option is D
All of these

Plant hormones or phytohormones can be defined as the factors affecting plant growth and regulating one or more physiological reactions (inhibitory or enhancing effect) which occurs naturally in plants.
(i) Growth promoters are Auxins, gibberellins and cytokinins
(ii) Growth inhibitors are Ethylene, abscisic acid, etc.

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