A typical angiosperm embroysac at maturity have:

Options

A. 7 celled- 8 nucleate
B. 9 celled -7 nucleat
C. 3 celled- 3 nucleate
D. 2 celled- 2 nucleate

Answer

To answer the question about the typical angiosperm embryo sac at maturity, we can break down the information step by step.

### Step-by-Step Solution:

1. **Understanding Angiosperms**:
- Angiosperms are flowering plants that produce seeds enclosed within a fruit. The female gametophyte in angiosperms is known as the embryo sac.

2. **Structure of the Embryo Sac**:
- The mature embryo sac consists of a total of 7 cells. These cells are organized into specific groups at each end of the sac.

3. **Cells at the Micropilar End**:
- At the micropilar end (the end where fertilization occurs), there are 3 cells:
- 2 synergids
- 1 egg cell
- This totals 3 cells at the micropilar end.

4. **Cells at the Chalazal End**:
- At the chalazal end (the opposite end of the micropilar end), there are 3 antipodal cells.
- This totals 3 cells at the chalazal end.

5. **Central Cell**:
- In addition to the cells at both ends, there is 1 central cell located in the middle of the embryo sac.
- The central cell contains 2 polar nuclei.

6. **Total Cell Count**:
- Adding the cells together:
- 3 (micropilar end) + 3 (chalazal end) + 1 (central cell) = 7 cells in total.

7. **Total Nuclei Count**:
- The nuclei count includes:
- 3 nuclei from the antipodal cells (1 nucleus each)
- 3 nuclei from the synergids and egg cell (1 nucleus each)
- 2 nuclei from the central cell (the two polar nuclei)
- This totals 3 + 3 + 2 = 8 nuclei.

8. **Final Answer**:
- Therefore, a typical angiosperm embryo sac at maturity has **7 cells and 8 nuclei**.

### Conclusion:
The correct answer is that a typical angiosperm embryo sac at maturity has **7-celled and 8-nucleate**.

---