A typical angiospermic embryo sac at maturity is eight nucleate and

Options

A. single celled
B. ) four celled
C. seven celled
D. eight celled

Answer

To answer the question regarding the typical angiospermic embryo sac at maturity, we will break down the information step by step.

### Step-by-Step Solution:

1. **Understanding the Structure of the Embryo Sac**:
- The angiospermic embryo sac is a crucial part of flowering plants' reproductive system. At maturity, it is known to be eight nucleate.

2. **Nuclei and Cells**:
- The term "eight nucleate" means that there are eight nuclei present within the embryo sac. However, it is important to note that these nuclei are not all contained within separate cells.

3. **Cell Count**:
- In a typical angiospermic embryo sac, there are seven cells. This is because one of the nuclei undergoes karyokinesis (nuclear division) without cytokinesis (cell division), resulting in more nuclei than cells.

4. **Types of Cells Present**:
- The seven cells consist of:
- **2 Synergids**: These cells are located at the micropyle end and assist in guiding the pollen tube.
- **1 Egg Cell**: This is also located at the micropyle end and is involved in fertilization.
- **3 Antipodal Cells**: These cells are found at the chalazal end of the embryo sac.
- **1 Polar Nucleus**: This nucleus is part of the central cell and is involved in double fertilization.

5. **Conclusion**:
- Therefore, while the embryo sac is eight nucleate, it is seven celled. The correct answer to the question is that a typical angiospermic embryo sac at maturity is seven celled.

### Final Answer:
The correct option is **C) seven celled**.

---