Pollen grain along with the growing tube has how many haploid nuclei?

Options

A. One
B. Two
C. Three
D. Four

Answer

To solve the question regarding how many haploid nuclei are present in a pollen grain along with the growing tube, we can break down the process as follows:

### Step-by-Step Solution:

1. **Understanding Pollen Grain Structure**:
- A pollen grain originates from a single haploid cell. This cell undergoes mitosis to form two distinct cells: a vegetative cell and a generative cell.

2. **Identifying Cell Types**:
- The vegetative cell is responsible for forming the pollen tube, while the generative cell will eventually produce male gametes.

3. **Mitosis of the Generative Cell**:
- The generative cell undergoes a second mitotic division, resulting in the formation of two male gametes. Each of these gametes is also haploid.

4. **Counting the Nuclei**:
- At this stage, the pollen grain consists of:
- 1 vegetative cell (with 1 haploid nucleus)
- 2 male gametes (each with 1 haploid nucleus)
- Therefore, the total number of haploid nuclei in the pollen grain is:
- 1 (from the vegetative cell) + 2 (from the male gametes) = 3 haploid nuclei.

5. **Conclusion**:
- Thus, the pollen grain along with the growing tube has a total of 3 haploid nuclei.

### Final Answer:
The total number of haploid nuclei in a pollen grain along with the growing tube is **3**.

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