In angiosperm ____ lead to the formation of a mature male gametophyte from a pollen mother cell

Options

A. two meitotic divisions
B. three mitotic division
C. two mitotic and one mitotic division
D. a single mitotic division

Answer

To answer the question, "In angiosperm ____ lead to the formation of a mature male gametophyte from a pollen mother cell," we need to understand the process of gametophyte development in flowering plants.

### Step-by-Step Solution:

1. **Identify the Starting Cell**: The process begins with the pollen mother cell (PMC), which is diploid (2n). This cell is responsible for producing the male gametophyte.

2. **Meiosis**: The pollen mother cell undergoes meiosis, which is a type of cell division that reduces the chromosome number by half. This process consists of two successive divisions:
- **Meiosis I**: The diploid PMC divides to form two haploid cells.
- **Meiosis II**: These two haploid cells divide again, resulting in a total of four haploid cells known as microspores.

3. **Formation of Tetrad**: The four haploid microspores are often referred to as a tetrad. Each of these microspores can develop into a pollen grain.

4. **Mitosis**: Each microspore undergoes mitosis to form a pollen grain. During this mitotic division:
- The microspore divides to produce two cells: the generative cell and the tube cell.
- The tube cell will eventually form the pollen tube, while the generative cell will later divide to form two sperm cells.

5. **Mature Male Gametophyte**: The mature male gametophyte is represented by the pollen grain, which consists of the tube cell and the generative cell. The generative cell will undergo another mitotic division to produce two sperm cells.

6. **Conclusion**: Therefore, the answer to the question is that the process that leads to the formation of a mature male gametophyte from a pollen mother cell involves **one meiotic division followed by two mitotic divisions**.

### Final Answer:
In angiosperms, **one meiotic division followed by two mitotic divisions** lead to the formation of a mature male gametophyte from a pollen mother cell.