A plant hormone which restricts growth in plants is abscisic acid or gibberellin or cytokinin or auxin
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Auxin is a plant hormone produced in the stem tip that promotes cell elongation. Auxin moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant. This produces a curving of the plant stem tip toward the light, a plant movement known as phototropism.
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Abscisic acid
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