Who proposed the idea that every plant cell is totipotent and can be used for the in vitro growth of plants?

For cryopreservation,plant materials are frozen at (in $^{\circ} C$)

Shoot tip culture is preferred for the international exchange of germplasm because...

How is tissue culture method useful for crop improvement?

Why is the culture continuously agitated in a rotary shaker during suspension culture?
$(i)$ To facilitate gas exchange for the cells.
$(ii)$ To ensure proper mixing of nutrients in the medium.
$(iii)$ To sterilize the equipment used in the process.
$(iv)$ To maintain a uniform temperature for the inoculum.
$(v)$ This process causes cell aggregates to break into smaller,distinct cell clusters.

In both callus and suspension cultures,the commonly used auxin is