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

Options

A. vegetative cell is not damaged
B. contents of killed generative cell stimulate pollen growth
C. laser beam stimulates growth of pollen tube
D. the region of emergence of pollen tube is not harmed

Explanation

### Step-by-Step Solution:

1. **Understanding the Structure of Pollen Grain**:
- Pollen grains consist of two main types of cells: the generative cell and the vegetative cell. The generative cell is responsible for producing male gametes (sperms), while the vegetative cell is responsible for the growth and maintenance of the pollen tube.

2. **Role of the Generative Cell**:
- The generative cell undergoes division to form two sperm cells. These sperm cells are essential for fertilization as they travel through the pollen tube to reach the embryo sac in the ovule.

3. **Role of the Vegetative Cell**:
- The vegetative cell does not participate in the formation of sperm but is crucial for the development of the pollen tube. It provides the necessary support and structure for the pollen tube to grow and function.

4. **Effect of Laser on Generative Cell**:
- When the generative cell is destroyed by a laser, it can no longer produce sperm cells. However, the vegetative cell remains intact and functional.

5. **Formation of Pollen Tube**:
- Since the vegetative cell is not damaged, it can still initiate and support the growth of the pollen tube. The pollen tube can still form and elongate towards the embryo sac, even in the absence of the generative cell.

6. **Conclusion**:
- The reason a normal pollen tube is still formed despite the destruction of the generative cell is that the vegetative cell is not damaged and continues to function normally, allowing for the growth of the pollen tube.

### Final Answer:
The correct explanation for why a normal pollen tube was still formed despite the destruction of the generative cell is that the vegetative cell is not damaged.

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