Q. Which of the following pair of hormones are required for a callus to differentiate ?

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Solution:

Callus is an unorganised mass of parenchyma cells. Callus cells are those cells that cover a plant wound and whose formation is induced from plant tissues after surface sterilization and plating onto in vitro tissue culture medium. Plant growth regulators, such as auxins, cytokinins, and gibberellins are supplemented into the medium to initiate callus formation or somatic embryogenesis.