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Stomatal open in the daytime due to...

Stomatal open in the daytime due to

A

Decrease in pH

B

Decrease in water potential

C

Increase in water potential

D

Light

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Stomata Function**: Stomata are small openings on the surface of leaves that allow for gas exchange. They are surrounded by guard cells that control their opening and closing. 2. **Role of Light**: During the daytime, light is a critical factor that influences the opening of stomata. Light triggers the process of photosynthesis, which requires carbon dioxide from the atmosphere. 3. **Potassium Ion (K+) Uptake**: In the presence of light, guard cells actively take up potassium ions (K+) from the surrounding cells. This uptake is facilitated by the active transport mechanisms in the guard cells. 4. **Change in Water Potential**: The influx of potassium ions into the guard cells leads to an increase in solute concentration inside these cells. This increase in solute concentration causes water to move into the guard cells by osmosis, as water moves from an area of higher water potential to an area of lower water potential. 5. **Guard Cell Turgidity**: As water enters the guard cells, they swell and become turgid. This turgidity causes the guard cells to bow outward, leading to the opening of the stomata. 6. **Conclusion**: Therefore, the primary reason for stomatal opening during the daytime is the presence of light, which initiates the uptake of potassium ions, leading to increased turgidity of the guard cells and the subsequent opening of the stomata. **Final Answer**: Stomatal opening in the daytime is due to **light**. ---
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