The outer wall of guard cell in sunflower is

Options

A. Thin and elastic
B. Thick and elastic
C. Thin and inelastic
D. Thick and inelastic

Answer

**Step-by-Step Solution:**

1. **Understanding Guard Cells**: Guard cells are specialized cells that surround the stomata (small pores) on the leaves of plants. They play a crucial role in regulating gas exchange and transpiration.

2. **Structure of Guard Cells**: Each stoma is flanked by a pair of guard cells. These cells are typically bean-shaped and can change shape to open or close the stomatal pore.

3. **Inner and Outer Walls**: The guard cells have two distinct walls:
- **Inner Wall**: This wall is thick and turgid, which helps in the opening and closing of the stomatal pore.
- **Outer Wall**: This wall is thin and elastic, allowing flexibility for the guard cells to change shape.

4. **Function of the Outer Wall**: The thin and elastic nature of the outer wall is essential for the guard cells to function properly. It allows them to expand and contract as they take in or lose water, which is crucial for the regulation of stomatal opening and closing.

5. **Conclusion**: Based on the properties of the outer wall of guard cells in sunflowers, we can conclude that the outer wall is thin and elastic.

6. **Final Answer**: The outer wall of the guard cell in sunflower is **thin and elastic**.

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