Totipotency can be defined as :

Capacity to generate whole plant from any cell/explant

The correct answer is Option (1)-Capacity to generate whole plant from any cell/explant

Totipotency can be defined as the capacity of a single cell or explant to generate a whole plant. This means that under the right conditions, a single cell or a small piece of plant tissue (explant) has the potential to give rise to all the cell types and structures necessary to develop into a complete, mature plant. This property is fundamental in plant tissue culture and regeneration techniques, where scientists can use cells or explants to propagate and produce new plants. The ability of a cell to differentiate into various specialized cell types is a characteristic feature of plant cells, which allows for totipotency.