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

Haploid cultures can be obtained by culturing:

Somaclones are obtained by

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

For which purpose is the embryo rescue method used?

Pollen grains of a plant whose $2n = 28$ are cultured to get callus by tissue culture method. What would be the number of chromosomes in the cells of the callus?