LABORATORY REVIEW
TRANSPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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increased wind speed helps to maintain high water vapour gradient across stomatal opening
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increased wind speed helps to keep the leaves moving, leading to increased evaporation of water
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increased wind speed increase the rate of photosynthesis
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increased wind speed increases the rate of stomatal opening
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Detailed explanation-1: -The rate of transpiration depends on various factors like humidity, temperature, sunlight, atmospheric pressure and wind speed. As the wind blows faster, the water released by transpiration is carried away faster. So, rate of transpiration increases with velocity of wind speed.
Detailed explanation-2: -Windy air contributes to evaporation. As wind speed increases, plants react by upping their rate of transpiration, which is the plant’s loss of water as it’s absorbed through the roots, up to the leaves, and out the leaves as it evaporates.
Detailed explanation-3: -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.
Detailed explanation-4: -At low stomatal conductance, transpiration is higher for low wind speed than for high wind speed, but as stomatal conductance increases, transpiration increases less at low wind speed compared with high wind speed because of limitation by the low leaf boundary layer conductance.