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Differentiation of callus requires a specific ratio of two hormones

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Auxin and gibberellin

Auxin and abscisic acid

Gibberellin and abscisic acid

IAA and cytokinin

answer is D.

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Detailed Solution

A high ratio of auxin to cytokinin leads to initiation of roots. Auxins like IAA, NAA stimulate generation of roots and cytokinin.

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