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Generative cell was destroyed by laser but a normal pollen tube was still formed because

1. vegetative cell is not damaged
2. contents of killed generative cell stimulate pollen growth
3. laser beam stimulates growth of pollen tube
4. the region of emergence of pollen tube is not harmed

Correct answer: vegetative cell is not damaged

Solution

The generative cell mainly forms the male gametes, while the vegetative cell controls pollen tube growth. So even if the generative cell is destroyed, a normal pollen tube can still develop as long as the vegetative cell is intact.

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