Question

. You know that plants lose water as water as vapour by the process of
transpiration. But the rate of transpiration is not same all the time. Why?

Answer 1

transpiration occurs in order to keep the plant cool. so it looses all it's water vapour. the rate of transpiration depends upon the amount of heat. when there is alot of temperature the plant looses more water at that time when the temperature is low it looses less water
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Answer 2

Because transpiration is effected by Intensity of sunlight, Temperature, Velocity of wind, Humidity, Carbon dioxide, and Atmospheric pressure. when sunlight, temperature, wind and pressure increases even transpiration increases. When carbon dioxide increases the transpiration decreases. Transpiration is reduced if the air outside is humid.