Spraying sugarcane crop with a plant hormone increases length of plants and increases yield by as much as $20$ tonnes/acre. The hormone is

Gibberellin

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Auxin

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Cytokinin

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ABA

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Solution

The correct option is A Gibberellin
Gibberellin is a plant hormone that produces various physiological responses in the plants. It stimulates stem elongation, flowering, germination. Due to their ability to increase the length of stem, it is used to increase the length of sugarcane stem. Sugarcane stem contains carbohydrate and yields are also increased.
Thus, the correct answer is option A.

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