In the fully developed angiospermic female gametophyte ,what is the ratio of haploid diploid and triploid cells ?

Options

A. `5:1:1`
B. `3 : 1 : 3`
C. `6 : 1 : 0`
D. `6 : 0 : 1`

Answer

To solve the question regarding the ratio of haploid, diploid, and triploid cells in the fully developed angiospermic female gametophyte, we can break it down step by step:

### Step-by-Step Solution:

1. **Understanding the Structure of the Female Gametophyte**:
- The fully developed female gametophyte in angiosperms is known as the embryo sac.
- The embryo sac typically contains **seven cells** and **eight nuclei**.

2. **Identifying the Types of Cells**:
- In the embryo sac, there are:
- **Three antipodal cells**: These cells are located at the opposite end of the embryo sac and are haploid (1n).
- **One central cell**: This cell is diploid (2n) because it contains two polar nuclei.
- **Egg apparatus**: This consists of:
- **One egg cell**: This is haploid (1n) and participates in fertilization.
- **Two synergids**: These are also haploid (1n) and assist in the fertilization process.

3. **Counting the Cells**:
- **Haploid cells**:
- 3 antipodal cells (haploid)
- 1 egg cell (haploid)
- 2 synergids (haploid)
- Total haploid cells = 3 + 1 + 2 = **6 haploid cells**.
- **Diploid cells**:
- 1 central cell (diploid)
- Total diploid cells = **1 diploid cell**.
- **Triploid cells**:
- There are no triploid cells in the mature angiospermic female gametophyte.
- Total triploid cells = **0 triploid cells**.

4. **Calculating the Ratio**:
- Now we can summarize the counts:
- Haploid cells = 6
- Diploid cells = 1
- Triploid cells = 0
- The ratio of haploid:diploid:triploid cells is therefore **6:1:0**.

### Final Answer:
The ratio of haploid, diploid, and triploid cells in the fully developed angiospermic female gametophyte is **6:1:0**.