Which of the following hormone is a plant growth inhibitor?

Auxin

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Gibberellin

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Abscisic acid

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Cytokinin

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Solution

The correct option is C Abscisic acid
Abscisic acid is a plant growth inhibitor. Auxin, gibberellin, and cytokinin are plant growth promoters.

S.No. Plant growth regulator Function

1. Auxin It initiates root formation in stem cuttings.

2. Gibberellin Promotes elongation of stem and seed germination.

3. Abscisic acid Inhibits the development and maturation of seed.

4. Cytokinin Helps in the production of leaves, chloroplast in leaves, lateral shoot growth and adventitious shoot formation.

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S.No.	Plant growth regulator	Function
1.	Auxin	It initiates root formation in stem cuttings.
2.	Gibberellin	Promotes elongation of stem and seed germination.
3.	Abscisic acid	Inhibits the development and maturation of seed.
4.	Cytokinin	Helps in the production of leaves, chloroplast in leaves, lateral shoot growth and adventitious shoot formation.