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B
Gibberellin
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C
Auxin
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D
Phytokinin
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Solution
The correct option is B Gibberellin Gibberellin was first discovered in 1935 by Teijiro Yabuta and Sumuki. It was isolated from fungus Gibberella fujikuroi and hence isolate was given gibberellin name. It is a plant growth regulator. It is involved in various processes like stem elongation, germination, dormancy, leaf and fruit senescence, etc.