Even after killing the generative cell with a laser beam, the pollen grain of a flowering plant germinates and produces normal pollen tube because

Options

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

Answer

**Step-by-Step Solution:**

1. **Understanding Pollen Grain Structure**: Pollen grains consist of two main cells: the vegetative cell and the generative cell. The vegetative cell is responsible for the growth of the pollen tube, while the generative cell typically divides to form two sperm cells.

2. **Effect of Laser Beam**: When the generative cell is killed using a laser beam, it does not affect the vegetative cell. The vegetative cell remains intact and functional.

3. **Role of the Vegetative Cell**: The vegetative cell is crucial for the process of pollen tube formation. It is responsible for the growth and development of the pollen tube, which is essential for fertilization.

4. **Pollen Tube Germination**: Since the vegetative cell is unaffected, it can still carry out its function. Therefore, even after the generative cell is destroyed, the pollen grain can germinate and produce a normal pollen tube.

5. **Conclusion**: The reason the pollen grain can still germinate and produce a normal pollen tube after the generative cell is killed is that the vegetative cell has not been damaged.

**Final Answer**: The vegetative cell has not been damaged.

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