Callus formation from mature tissue explant occurs through

A. From a fertilized cell of female gametophyte B. From an unfertilized cell of female gametophyte C. From isolated pollen grains D. By selective elimination of chromosomes following distant hybridization

A. Unfertilized eggs B. Fertilized eggs C. Sporophytic cells D. Male gametophyte

A. A single cell B. A single explant C. Many explants from a single plant D. Many explants from a group of plants

A. Both (A) and (R) are true but (R) is not the correct reason for (A) B. (A) is false but (R) is true C. (A) is true but (R) is false D. Both (A) and (R) are true and (R) is the correct reason for (A)