$EDTA$ is widely used in tissue cultures; it is a:

What is done during the process of hardening?

Plants are more rapidly manipulated by genetic engineering than animals due to:

$S$ - Statement: An undifferentiated mass of cells in a culture is called callus.
$R$ - Reason: Auxin and cytokinin are added as growth regulators in the culture medium for callus induction.

Which growth promoter is added to the callus culture medium?

Exchange of germplasm is carried preferably through shoot tip culture because they are