Plant Cell Culture
The phenomenon of the reversion of mature cells to the meristematic state leading to the formation of callus is known as

none of these
redifferentiation
dedifferentiation
either (a) or (b)

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Plant Cell Culture
In a callus culture

increasing level of auxin to a callus induces shoot formation and increasing level of cytokinin promote root formation
only auxin is required for root and shoot formation
increasing level of cytokinin to a callus induces shoot formation and increasing level of auxin promote root formation
auxins and cytokinins are not required

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