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

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

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Plant Cell Culture
In a callus culture

only auxin is required for root and shoot formation
auxins and cytokinins are not required
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

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

The aspects of culture in community which are mainly dedicated by the need of a specified organ of the human body
Maintenance alive of a whole organ, after removal from the organism by partial immersion in a nutrient fluid
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

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