Somaclones can be obtained from which of the following?

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.

Virus-free plants can be generated through-

Which method is used for the rapid multiplication of banana plants?

What is callus?

Hardening in tissue culture is