The stomatal are celled sunken when

Options

A. Guard cells are in the line with epidermal cells
B. Guard cells are situated below epidermal cells
C. Guard cells are situated above epidermal cells
D. Guard cells occur in lower epidermal

Answer

**Step-by-Step Solution:**

1. **Understanding Stomata and Guard Cells:**
- Stomata are small openings on the surface of leaves that allow for gas exchange (CO2 and O2) and transpiration.
- Each stoma is surrounded by a pair of specialized cells called guard cells that regulate its opening and closing.

2. **Definition of Sunken Stomata:**
- Sunken stomata refer to stomata that are located in a small pit or depression on the leaf surface. This adaptation helps reduce water loss in plants, especially in arid environments.

3. **Analyzing the Options:**
- **Option A:** Guard cells are in line with epidermal cells. (This would mean the stomata are at the surface level, not sunken.)
- **Option B:** Guard cells are situated below epidermal cells. (This indicates that the stomata are sunken into the leaf tissue.)
- **Option C:** Guard cells are situated above epidermal cells. (This would also mean the stomata are not sunken.)
- **Option D:** Guard cells occur in the lower epidermal. (This does not specify their position relative to the epidermis.)

4. **Identifying the Correct Answer:**
- The correct answer is **Option B: Guard cells are situated below epidermal cells**. This indicates that the stomata are sunken into the leaf, which is characteristic of sunken stomata.

5. **Conclusion:**
- Sunken stomata are an adaptation found in some plants to minimize water loss and are characterized by guard cells that are located below the epidermis.