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 answer the question, we need to identify the specific nucleated stage after which cell walls are laid down, leading to the organization of the typical female gametophyte. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Understanding Nucleated Stages**: In the development of the female gametophyte (embryo sac) in flowering plants, there are several stages characterized by the number of nuclei present. The key stages are:
- **Diad Stage**: 2 nuclei
- **Tetrad Stage**: 4 nuclei
- **Octad Stage**: 8 nuclei

2. **Identifying the Relevant Stage**: The question asks for the stage after which cell walls are laid down. According to the information provided, the organization of the typical female gametophyte begins after the 8-nucleated stage.

3. **Conclusion**: Therefore, the correct answer to fill in the blank is "8". After the 8-nucleated stage, cell walls are laid down, leading to the formation of a well-organized female gametophyte.

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

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