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Differentiation of shoot is controlled by

1. high gibberellin : cytokinin ratio
2. high auxin : cytokinin ratio
3. high cytokinin : auxin ratio
4. high gibberellin : auxin ratio

Correct answer: high cytokinin : auxin ratio

Solution

Shoot differentiation is promoted when cytokinin levels exceed auxin levels. In plant tissue culture, a high cytokinin-to-auxin ratio directs cells toward shoot formation, while the opposite ratio favors roots.

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