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 will analyze the types of embryo sacs and their characteristics step by step.

### Step-by-Step Solution:

1. **Understanding the Embryo Sac**:
- The embryo sac is the female gametophyte in flowering plants, which develops from a megaspore mother cell (MMC) through meiosis and mitosis.

2. **Identifying the Types of Embryo Sacs**:
- There are three main types of embryo sacs based on the number of megaspores involved in their formation:
- **Monosporic**: Formed from one megaspore. This results in a 7-celled, 8-nucleate structure.
- **Bisporic**: Formed from two megaspores. This typically results in a different structure.
- **Tetrasporic**: Formed from four megaspores. This also results in a different structure.

3. **Analyzing the Given Information**:
- The question specifies a 7-celled and 8-nucleate embryo sac.
- A 7-celled, 8-nucleate embryo sac is characteristic of a monosporic development, where one megaspore undergoes three mitotic divisions.

4. **Conclusion**:
- Since the question asks about a 7-celled and 8-nucleate embryo sac, the correct answer is that it is **monosporic**.
- However, since the options include "all of these," we need to consider that while the 7-celled, 8-nucleate structure is primarily monosporic, the question may be looking for a broader interpretation that includes all types of embryo sacs.

5. **Final Answer**:
- The correct answer is **Option 4: All of these**, as it encompasses the possibility of different types of embryo sacs, although the specific structure described fits the monosporic type.