Virus-free plants can be obtained through $-$

Which method was used to transfer the streptomycin resistance gene from $Nicotiana$ $tabacum$ to $Nicotiana$ $sylvestris$?

The technique of parasexual fusion was first discovered by

Scientists have succeeded in culturing meristems of:

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.

The process of achieving the propagation of a large number of plants in a very short duration is known as ............