Stomata remain open when relative humidity is :

Above 70%

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50-70%

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30-50%

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Below 30%

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Solution

The correct option is A Above 70%
During the humid atmosphere, stomata opens for longer duration and widens more. So, when relative humidity is above 70%, stomata is wide open. However, stomata remains closed in dry atmosphere or when the relative humidity is lesser than 50%
Thus, the correct answer is option (A).

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