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Question

Callus is a

A
plant hormone
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B
mass of undifferentiated cells
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C
root formation in culture
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D
plant by-product
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Solution

The correct option is B mass of undifferentiated cells
Callus is a mass of proliferative, undifferentiated cells produced from isolated differentiated or undifferentiated plant cells when grown aseptically on artificial nutrient medium in glass vials un­der controlled experimental conditions.

A whole plant can be regenerated in large numbers from callus tissue through manip­ulation of the nutrient and hormonal con­stituents in a culture medium.

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