Select an incorrect statement regarding stomatal opening.

Options

A. Stomata tend to open more with an increase in temperature
B. In some plant species, stomata remain closed even under continuous light at `0^(@)C`.
C. At temperatures higher than`40^(@)C`, there is a decline in stomatal opening in some species.
D. With an increase in carbon dioxide concentration inside the leaf, the stomata open

Answer

To solve the question regarding the incorrect statement about stomatal opening, we will analyze each option provided in the context of stomatal function.

### Step-by-Step Solution:

1. **Understand the Function of Stomata**:
- Stomata are small openings on the surfaces of leaves that facilitate gas exchange (CO2 and O2) and transpiration (loss of water vapor).

2. **Identify Factors Influencing Stomatal Opening**:
- The main factors that influence the opening of stomata include:
- Temperature
- Light intensity
- Humidity
- Carbon dioxide concentration

3. **Evaluate Each Statement**:
- **Option 1**: "Stomata tend to open more with an increase in temperature."
- This statement is **correct**. Higher temperatures generally lead to increased stomatal opening to facilitate transpiration.

- **Option 2**: "In some plant species, stomata remain closed even under continuous light at 0 degrees Celsius."
- This statement is **correct**. Some plants, especially those adapted to cold environments, may not open their stomata even in light if the temperature is too low.

- **Option 3**: "At temperatures higher than 40 degrees Celsius, there is a decline in stomatal opening in some species."
- This statement is **correct**. Excessive heat can lead to stomatal closure to prevent water loss.

- **Option 4**: "With an increase in carbon dioxide concentration inside the leaf, the stomata open."
- This statement is **incorrect**. Generally, an increase in internal CO2 concentration leads to stomatal closure, as the plant does not need to take in more CO2 when it is already abundant.

4. **Conclusion**:
- The incorrect statement regarding stomatal opening is: "With an increase in carbon dioxide concentration inside the leaf, the stomata open."

### Final Answer:
The incorrect statement regarding stomatal opening is: **"With an increase in carbon dioxide concentration inside the leaf, the stomata open."**

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