Somaclonal variation appears in

Producing new plants by cells instead of seeds is known as:

Somaclones are obtained by

Tissue culture was launched by

$A:$ In plant tissue culture,the nutrients in the medium decrease.
$R:$ In this method,the biomass of cells or tissues increases.

"Give me a living cell of any plant and $I$ will give you a thousand plants of the same type". Is this only a slogan or is it scientifically possible? Write your comments and justify them.