PLANT PHYSIOLOGY
TRANSPORT IN PLANT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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as the wind speed increase, the rate oftranspiration decrease
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as the wind speed increase, the rate oftranspiration increase
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as the wind speed decrease the rate oftranspiration increase
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the wind speed is not affecting the rates oftranspiration
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Detailed explanation-1: -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: -Wind & air movement: Increased movement of the air around a plant will result in a higher transpiration rate. Wind will move the air around, with the result that the more saturated air close to the leaf is replaced by drier air.
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: -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. More than 90 percent of the water a plant absorbs is lost by transpiration.
Detailed explanation-5: -Excess water loss (transpiration) causes stomata closure and therefore decreases the photosynthetic rate. Transpiration from the leaves is made mainly through the stomata and partly through the cuticle.