Protoplasts of two different species are fused in

Assertion $A$: In the plant tissue culture method,the nutrient content of the medium decreases.
Reason $R$: In this method,the biomass of cells or tissues increases.
Which option is correct for Assertion $A$ and Reason $R$?

The separation of cells from the rest of the callus is:

Which statement is incorrect regarding callus culture?

Which statement is most appropriate for plant tissue culture?

Plants,in comparison to animals,are more rapidly manipulated by genetic engineering. Select the most probable reason for this.