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Stomata remain open when relative humidi...

Stomata remain open when relative humidity is

A

Above 70%

B

50%-70%

C

30%-50%

D

Below 30%

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 (CO2 in, O2 out) and transpiration (water vapor loss). Their opening and closing are influenced by various environmental factors. 2. **Factors Affecting Stomatal Opening**: The primary factors that control the opening and closing of stomata include light intensity, humidity, and solute concentration (water availability). 3. **Role of Relative Humidity**: Relative humidity is a measure of the amount of moisture in the air compared to the maximum amount of moisture the air can hold at a given temperature. It significantly affects stomatal behavior. 4. **Stomata in Humid Conditions**: When relative humidity is high (above 70%), the atmosphere is moist, which encourages stomata to remain open for extended periods. This allows for efficient gas exchange and transpiration. 5. **Stomata in Dry Conditions**: Conversely, when relative humidity is low (below 50%), the dry atmosphere causes stomata to close to prevent excessive water loss, which is crucial for plant survival. 6. **Conclusion**: Based on the understanding of how humidity affects stomatal behavior, we can conclude that stomata remain open when relative humidity is above 70%. Therefore, the correct answer to the question is **above 70%**. ### Final Answer: Stomata remain open when relative humidity is **above 70%**. ---
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