Guard cells of stomata are very closely associated with

Options

A. Subsidiary cells
B. Complementary cells
C. Epithem
D. Epidermal cells

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure of Stomata**: Stomata are small openings found on the surface of leaves, primarily on the underside. They play a crucial role in gas exchange and transpiration in plants.

2. **Role of Guard Cells**: Each stoma is flanked by a pair of specialized cells known as guard cells. These cells are responsible for regulating the opening and closing of the stomata.

3. **Function of Guard Cells**: The guard cells control the size of the stomatal opening, which in turn regulates the rate of transpiration (the loss of water vapor from the plant). When guard cells take up water and swell, they bend away from each other, opening the stomata. Conversely, when they lose water, they become flaccid and close the stomata.

4. **Association with Other Cells**: The question asks what the guard cells are closely associated with. The guard cells are closely associated with subsidiary cells, which are located adjacent to them and support their function.

5. **Conclusion**: Therefore, the correct answer to the question is that guard cells of stomata are very closely associated with subsidiary cells.

**Final Answer**: Guard cells of stomata are very closely associated with subsidiary cells.

---