Dwarfness can be controlled by treating the plant with

Cytokinin

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Gibberellic acid

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Auxin

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Antigibberellin

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Solution

The correct option is B Gibberellic acid
Gibberellic acid is a plant hormone which helps in stem and root elongation, internodule elongation and helps in floral development. It also stimulates cell elongation in stem which prevent dwarfness in plants.
Thus, the correct answer is 'Gibberellic acid.'

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