Plant Cell Culture
Organogenesis is

genesis of organs
formation of callus tissue
formation of root and shoots on callus tissue
both (a) and (b)

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Plant Cell Culture
In a callus culture

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

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