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Which of the following is NOT a plant growth regulator?

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Which of the following is NOT a plant growth regulator?

(a) Auxin

(b) Cytokinins

(c) Abcisic acid

(d) Polyphenols

This question was posed to me in unit test.

This is a very interesting question from Plant Tissue Culture in chapter Recombinant DNA Technology of Life Sciences

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Right choice is (d) Polyphenols

The best I can explain: Plant growth regulators are the compound which at very low concentration can modify plant growth and its morphogenesis. Polyphenols are not considered as plant growth regulators but they are produced due to the plant defense mechanism.

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