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
dedifferentiation
redifferentiation
either (a) or (b)

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Plant Cell Culture
In a callus culture

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

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Plant Cell Culture
What is meant by 'Organ culture' ?

Introduction of a new organ in an animal body with a view to create genetic mutation in the progenies of that animal
Cultivation of organs in a laboratory through the synthesis of tissues
Maintenance alive of a whole organ, after removal from the organism by partial immersion in a nutrient fluid
The aspects of culture in community which are mainly dedicated by the need of a specified organ of the human body

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