Even after killing the generative cell with a laser beam, the pollen grain of a flowering plant germinates and produces normal pollen tube because _______________________________.
During microspore development, cellular differentiation arises. Then Generative and vegetative cells are formed. The generative cell produces two sperm cells. While the vegetative cell produces the pollen tube. That helps to deliver the male gametes to the embryo sac. However if a laser beam kills the generative cell, it will be ineffective on the normal pollen tube formation.
Thus, the correct answer is option D.