LABORATORY REVIEW
TRANSPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Farm B will experience a higher rate of transpiration because of the higher water vapour gradient across the leaf surface
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Farm A plants will experience higher rate of transpiration because of the higher water vapor gradient across the plant leaves
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Farm B will experience higher rate of transpiration because more of the stomata there will be open
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Farm A will experience lowerer rate of transpiration because of the reduced thickness of the plants’ waxy cuticle
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Detailed explanation-1: -As the relative humidity of the air surrounding the plant rises the transpiration rate decreases. It is easier for water to evaporate into dryer air than into more saturated air. Increased movement of the air around a plant will result in a higher transpiration rate.
Detailed explanation-2: -Plants transpire more rapidly in the light than in the dark. This is largely because light stimulates the opening of the stomata (mechanism). Light also speeds up transpiration by warming the leaf. Plants transpire more rapidly at higher temperatures because water evaporates more rapidly as the temperature rises.
Detailed explanation-3: -At high atmospheric humidity, transpiration is low. This is because the rate of transpiration is directly proportional to the saturation deficit. It is dependent on the gradient of vapor pressure. Thus, the higher the humidity, the lower the rate of transpiration.
Detailed explanation-4: -The rate of transpiration increases when atmospheric pressure is low. During low atmospheric pressure, air will move out of the plant as a result of diffusion. At low pressure, the water vapour moves fast thus the rate of transpiration increases. At higher atmospheric pressure plant will lose water at slow rate.