Conversion of starch to organic acids is required for

Options

A. stomatal opening
B. stomatal closure
C. stomal formation
D. hydothode functioning

Answer

**Step-by-Step Solution:**

1. **Understanding Stomatal Function**: Stomata are small openings on the surface of leaves that allow for gas exchange. Their opening and closing are crucial for photosynthesis and transpiration.

2. **Role of Starch**: Starch is a carbohydrate stored in plants. During the day, when photosynthesis occurs, starch can be converted into organic acids.

3. **Conversion Process**: The conversion of starch to organic acids, such as malic acid, occurs in the guard cells surrounding the stomata. This process is facilitated by enzymes and is influenced by light.

4. **Proton Concentration**: The conversion of starch to organic acids increases the concentration of protons (H⁺ ions) in the guard cells. This increase in proton concentration leads to the dissociation of organic acids.

5. **Ion Movement**: As protons move out of the guard cells to maintain electrical neutrality, potassium ions (K⁺) move into the guard cells. This influx of potassium ions is crucial for the next step.

6. **Water Potential and Turgidity**: The movement of potassium ions into the guard cells lowers the water potential inside these cells. Consequently, water enters the guard cells by osmosis, causing them to swell and become turgid.

7. **Stomatal Opening**: The turgidity of the guard cells results in the opening of the stomata. Thus, the conversion of starch to organic acids is essential for stomatal opening.

8. **Conclusion**: Therefore, the conversion of starch to organic acids is required for stomatal opening.

**Final Answer**: The conversion of starch to organic acids is required for **stomatal opening**.

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