In angiosperms, polygonum type of female gametophyte develops after

Options

A. 1 meiosis, 2 mitosis
B. 2 meiosis, 3 mitosis
C. 1 meiosis, 3 mitosis
D. 3 meiosis, 3 mitosis

Answer

To answer the question regarding the development of the Polygonum type of female gametophyte in angiosperms, we can break down the process into clear steps:

### Step-by-Step Solution:

1. **Understanding the Ovule Structure**:
- In angiosperms, the female gametophyte develops within the ovule. The ovule contains a diploid cell known as the megaspore mother cell (MMC).

2. **Meiosis**:
- The MMC undergoes meiosis, which is the first step in the formation of the female gametophyte. This process results in the formation of four haploid megaspores.
- Out of these four megaspores, three typically degenerate, leaving only one functional megaspore.

3. **Mitosis**:
- The remaining functional megaspore then undergoes a series of mitotic divisions.
- The first mitotic division produces a two-cell stage.
- The second mitotic division results in a four-nucleate stage.
- The third mitotic division leads to an eight-nucleate stage.

4. **Formation of the Mature Female Gametophyte**:
- In the eight-nucleate stage, the nuclei arrange themselves into specific cell types:
- Two nuclei migrate to the center to form the central cell (which contains two polar nuclei).
- Three nuclei form the antipodal cells at the chalazal end.
- Two nuclei form the synergids and one nucleus forms the egg cell at the micropylar end, collectively known as the egg apparatus.

5. **Conclusion**:
- Thus, the Polygonum type of female gametophyte, which is an eight-nucleate and seven-celled structure, develops after one meiotic division followed by three mitotic divisions.

### Final Answer:
The Polygonum type of female gametophyte develops after **1 meiosis and 3 mitosis**.