7 celled-8 nucleate embryosac is

Options

A. Monosporic
B. Bisporic
C. Tetrasporic
D. All of these

Answer

To solve the question regarding the 7-celled and 8-nucleate embryo sac, we can break it down step by step.

### Step-by-Step Solution:

1. **Understanding the Structure**:
- The embryo sac is a female gametophyte found in flowering plants. It typically consists of 7 cells and 8 nuclei.
- The arrangement includes three antipodal cells, one egg cell, two synergids, and one central cell with two polar nuclei.

2. **Identifying the Types of Embryo Sac**:
- The embryo sac can be classified based on how many megaspores contribute to its formation:
- **Monosporic**: Formed from one megaspore.
- **Bisporic**: Formed from two megaspores.
- **Tetrasporic**: Formed from four megaspores.

3. **Analyzing the Nuclei and Cells**:
- Regardless of whether the embryo sac is monosporic, bisporic, or tetrasporic, the final structure remains the same: 7 cells and 8 nuclei.
- This means that all three types of structures can lead to the same embryo sac configuration.

4. **Conclusion**:
- Since the question asks which sporic structure can have a 7-celled and 8-nucleate embryo sac, the answer encompasses all three types: monosporic, bisporic, and tetrasporic.
- Therefore, the correct answer is **"all of these"**.