In a fully developed male gametophyte the number of nuclei is

Options

A. one
B. five
C. three
D. four

Answer

To determine the number of nuclei in a fully developed male gametophyte, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Male Gametophyte Structure**:
- A male gametophyte in flowering plants typically consists of two main types of cells: the vegetative cell and the generative cell.

2. **Identifying the Cells**:
- The **vegetative cell** is responsible for the growth of the pollen tube.
- The **generative cell** divides to form two male gametes (sperm cells).

3. **Counting the Nuclei**:
- The vegetative cell contains **1 nucleus**.
- The generative cell, upon division, produces **2 nuclei** (one for each male gamete).

4. **Total Count**:
- Adding these together gives us:
- 1 nucleus from the vegetative cell + 2 nuclei from the generative cell = **3 nuclei** in total.

5. **Conclusion**:
- Therefore, in a fully developed male gametophyte, the total number of nuclei is **3**.

### Final Answer:
The number of nuclei in a fully developed male gametophyte is **3**.