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Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.

1. Gibberellin
2. Ethylene
3. Abscisic acid
4. Cytokinin

Correct answer: Gibberellin

Solution

Gibberellins stimulate stem elongation by increasing cell division and cell elongation, especially in internodes. In sugarcane, spraying gibberellin lengthens the stem, which increases biomass and yield.

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