The number of nuclei in a mature embryo sac are

Options

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

Answer

To determine the number of nuclei in a mature embryo sac, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Embryo Sac**:
- The embryo sac is the female gametophyte located within the ovule of flowering plants. It plays a crucial role in reproduction.

2. **Identify the Components of the Embryo Sac**:
- The mature embryo sac typically contains:
- 1 egg cell
- 2 synergid cells
- 3 antipodal cells
- 1 central cell with 2 polar nuclei

3. **Count the Cells**:
- If we count the total number of cells:
- 1 (egg) + 2 (synergids) + 3 (antipodals) = 6 cells
- However, the central cell is counted separately in terms of nuclei.

4. **Count the Nuclei**:
- Now, let's count the nuclei:
- The egg cell has 1 nucleus.
- Each synergid has 1 nucleus (2 total for 2 synergids).
- Each antipodal cell has 1 nucleus (3 total for 3 antipodals).
- The central cell has 2 polar nuclei.
- Therefore, the total number of nuclei is:
- 1 (from the egg) + 2 (from the synergids) + 3 (from the antipodals) + 2 (from the polar nuclei) = 8 nuclei.

5. **Conclusion**:
- The total number of nuclei in a mature embryo sac is **8**.

### Final Answer:
The number of nuclei in a mature embryo sac is **8**.