The nature of guard cells cell wall away from and towards the stomatal pore is respectively

Options

A. Thick, Thin
B. Thin, Thick
C. Thin, thin
D. Thick, thick

Answer

**Step-by-Step Solution:**

1. **Understanding Guard Cells**: Guard cells are specialized cells that surround the stomatal pore in plant leaves. They play a crucial role in regulating the opening and closing of the stomata, which is essential for gas exchange and transpiration.

2. **Structure of Guard Cells**: Each guard cell has two sides: one side faces the stomatal pore (the inner side), and the other side faces away from the pore (the outer side).

3. **Cell Wall Thickness**: The thickness of the cell walls of guard cells is not uniform. The wall that is towards the stomatal pore is thicker, while the wall that is away from the pore is thinner.

4. **Function of Cell Wall Thickness**:
- The **thick wall** towards the pore helps to prevent the guard cell from bulging into the stomatal opening when the cell becomes turgid (swollen with water).
- The **thin wall** away from the pore allows for flexibility and expansion, which is necessary for the guard cells to change shape and regulate the size of the stomatal opening.

5. **Conclusion**: Therefore, the nature of the guard cells' cell walls is that the wall towards the stomatal pore is thick, and the wall away from the pore is thin.

**Final Answer**: The nature of guard cells' cell wall away from and towards the stomatal pore is respectively **thin and thick**.

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