After the_______ nucleate stage cell walls are laid down leading to the organisation of the typical female gametophyte

Options

A. two
B. four
C. six
D. eight

Answer

To solve the question, we need to identify the correct stage after which cell walls are laid down to form the typical female gametophyte. Here's the step-by-step solution:

1. **Understanding the Megasporogenesis**: The process begins with the megaspore mother cell undergoing meiosis to produce four megaspores. Typically, only one of these megaspores survives.

2. **First Mitotic Division**: The surviving megaspore undergoes its first mitotic division, resulting in two nuclei. This stage is referred to as the 2-nucleate stage.

3. **Second Mitotic Division**: The two nuclei then undergo a second mitotic division, resulting in four nuclei. This stage is known as the 4-nucleate stage.

4. **Third Mitotic Division**: The four nuclei undergo a third mitotic division, leading to eight nuclei. This stage is called the 8-nucleate stage.

5. **Formation of the Female Gametophyte**: After reaching the 8-nucleate stage, the cell walls are laid down, which organizes the nuclei into a typical female gametophyte or embryo sac.

6. **Conclusion**: Therefore, the correct answer to the question is "8". After the 8-nucleate stage, cell walls are laid down leading to the organization of the typical female gametophyte.

**Final Answer**: After the 8 nucleate stage, cell walls are laid down leading to the organization of the typical female gametophyte.

---