These processes are necessary for the complete development of male gametophyte from pollen mother cell

Options

A. One meiotic and two mitotic division
B. One meiotic cell division and one mitotic cell division
C. Two meiotic cell division and one mitotic cell division
D. Two mitotic cell division

Explanation

To answer the question regarding the processes necessary for the complete development of the male gametophyte from the pollen mother cell, we can break down the steps as follows:

### Step-by-Step Solution:

1. **Identify the Starting Point**:
- The process begins with the pollen mother cell, also known as the microspore mother cell (MMC).

2. **Meiotic Division**:
- The first crucial step is meiosis, where the pollen mother cell undergoes meiotic division. This results in the formation of four haploid microspores.
- **Hint**: Remember that meiosis reduces the chromosome number by half, producing haploid cells.

3. **Microspore Formation**:
- After meiosis, the four microspores are formed. These microspores are initially in a tetrad structure but will separate from each other.
- **Hint**: Think of microspores as the building blocks that will develop into pollen grains.

4. **Mitotic Division**:
- Each microspore undergoes a mitotic division. This results in the formation of two cells within each microspore: a larger vegetative cell and a smaller generative cell.
- **Hint**: Mitosis is a process that maintains the chromosome number, producing identical cells.

5. **Generative Cell Division**:
- The generative cell itself undergoes another mitotic division, leading to the formation of two male gametes (sperm cells).
- **Hint**: This step is crucial as it results in the actual male gametes that will participate in fertilization.

6. **Final Structure of Male Gametophyte**:
- At the end of these processes, the mature pollen grain consists of three cells: one vegetative cell and two male gametes.
- **Hint**: The final structure is essential for the fertilization process in flowering plants.

### Summary of Key Processes:
- **One meiotic division** (to produce microspores)
- **Two mitotic divisions** (one for the microspore to form vegetative and generative cells, and one for the generative cell to form two male gametes)

### Conclusion:
The complete development of the male gametophyte from the pollen mother cell involves one meiotic division followed by two mitotic divisions.

### Final Answer:
The processes necessary for the complete development of the male gametophyte from the pollen mother cell are:
- One meiotic division and two mitotic divisions.