Even after killing the generative cell with a laser beam, the pollen grain of a flowering plant germinates and produces normal pollen tube because [NCERT 1983; CBSE PMT 1989; JIPMER 1993]

• A. Laser beam stimulates pollen germination and pollen tube growth
• B. The laser beam does not damage the region from which pollen tube emerges
• C. The contents of killed generative cell permit germination and pollen tube growth
• D. The vegetative cell has not been damaged