Well developed archegonium with neck having 6 and 4 rows of neck cells occurs in

Options

A. Pteridophytes and gymnosperms
B. Gymnosperms and flowering plants
C. Gymnosperms only
D. Bryophytes and pteridophytes.

Answer

To solve the question regarding the well-developed archegonium with neck cells, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Archegonium**:
- The archegonium is the female reproductive structure in certain plants, particularly in bryophytes and pteridophytes. It is responsible for producing eggs.

2. **Identify the Structure of the Archegonium**:
- The archegonium is typically flask-shaped, consisting of a swollen base known as the venter and a long, slender neck.

3. **Neck Cells**:
- The neck of the archegonium is made up of neck cells. The number of rows of neck cells can vary between different groups of plants.

4. **Count the Rows of Neck Cells**:
- In bryophytes, the neck of the archegonium has **6 rows of neck cells**.
- In pteridophytes, the neck has **4 rows of neck cells**.

5. **Analyze the Options**:
- The question provides several options:
- Pteridophytes and gymnosperms
- Gymnosperms and flowering plants
- Gymnosperms only
- Bryophytes and pteridophytes

6. **Determine the Correct Answer**:
- Since the question specifies a well-developed archegonium with neck cells, we need to identify which group has the specified number of neck cells.
- The correct answer is **Bryophytes (6 rows of neck cells)** and **Pteridophytes (4 rows of neck cells)**.

7. **Final Conclusion**:
- Therefore, the correct answer is **Bryophytes and Pteridophytes**.