A typical angiospermic embryo sac is:

Options

A. 7- called and 7- nucleate.
B. 8- called and 7- nucleate.
C. 7- called and 8- nucleate.
D. None of these

Answer

To answer the question about the structure of a typical angiospermic embryo sac, we can break it down step by step:

### Step-by-Step Solution:

1. **Understanding the Embryo Sac**: The embryo sac is a crucial structure in angiosperms (flowering plants) that contains the female gametes. It is formed from the megasporangium and is typically located within the ovule.

2. **Identifying the Cells**: A typical angiospermic embryo sac contains a total of seven cells. These cells can be categorized as follows:
- **Antipodal Cells**: There are three cells located at the opposite end of the embryo sac. These are known as antipodal cells.
- **Polar Nuclei**: In the center of the embryo sac, there are two polar nuclei that are typically found within a single cell.
- **Egg Cell**: At the bottom of the embryo sac, there is one egg cell.
- **Synergids**: Flanking the egg cell, there are two synergid cells.

3. **Counting the Cells**:
- Antipodal cells: 3
- Polar nuclei: 1 cell containing 2 nuclei
- Egg cell: 1
- Synergids: 2

Adding these together:
- Total cells = 3 (antipodal) + 1 (polar) + 1 (egg) + 2 (synergids) = 7 cells.

4. **Counting the Nuclei**:
- Antipodal cells: 3 nuclei (1 per cell)
- Polar nuclei: 2 nuclei (since they are in one cell)
- Egg cell: 1 nucleus
- Synergids: 2 nuclei (1 per cell)

Adding these together:
- Total nuclei = 3 (antipodal) + 2 (polar) + 1 (egg) + 2 (synergids) = 8 nuclei.

5. **Conclusion**: Therefore, the typical angiospermic embryo sac is characterized as having **7 cells and 8 nuclei**. This is the correct answer to the question.

### Final Answer:
The typical angiospermic embryo sac is **7-celled and 8-nucleate**.