What is the capacity to generate a whole plant from any cell called?

The part of the plant taken for tissue culture is called:

What is the remaining part of a plant cell called after the digestion of its cell wall?

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

Identify the incorrect statements from the following:
$(i)$ Callus is obtained in $2$ to $3$ weeks.
$(ii)$ Suspension culture does not show faster growth compared to callus culture.
$(iii)$ Orchid seeds do not contain stored food.
$(iv)$ $2,4-D$ is used only in callus culture.

In which method are groups of cells suspended in a liquid medium?