Rate of transpiration is more when:- (a) atmosphere is dry, (b) temperature is high, (c) humidity is high, (d) atmosphere is high and temperature is high. However, if the atmosphere is dry, there will be a steep water concentration gradient between the humid inside of the stomata and the outside air and the rate of transpiration will therefore be fast. If there is wind, it moves this water vapor laden air away while dry air takes its place. In dim light or on a cloudy day the stomata are partially closed reducing the rate of transpiration. The rate of transpiration depends upon the difference in the vapour pressure between the internal atmosphere of the leaf and air outside the leaf. Sunken stomata, as in adelfa or Nerium oleander, also lessen the rate of transpiration by sheltering the boundary layer from wind movement. (b) Humidity of the atmosphere: If the air outside is humid the rate of transpiration is reduced, since the outward diffusion … Since relative humidity is the actual amount of water vapours in the atmosphere at any given time, the rate of transpiration is mainly dependent on it. The cuticle, being made of wax, has a limiting effect on the transpiration rate by hampering the diffusion of water vapor to the outside atmosphere. Solution:-(b) temperature is high. The lower the RH, the less moist the atmosphere and thus, the greater the driving force for transpiration. How Do Plants Lose Water? Transpiration vs humidity. The apparatus shown in the following diagram is Garreau’s potometer designed to demonstrate unequal transpiration from the two surfaces of a dorsiventral leaf Before keeping the leaf in between the cups, anhydrous calcium chloride (CaCl 2) contained in two small vials were weighed and placed in both the cups.The ends of … Any reduction in water in the atmosphere creates a gradient for water to move from the leaf to the atmosphere. Transpiration is very important for maintaining moisture conditions in the environment. However, if the atmosphere is dry, there will be a steep water concentration gradient between the humid inside of the stomata and the outside air and the rate of transpiration will therefore be fast. In strong light, the rate of transpiration is more because stomata are wide open. Transpiration occurs because plants take in more water than they actually need at a given time. Factors that affect the rate of transpiration also affect water uptake by the plant. 4. Due to this, air has a lot of capacity to hold water and thus the rate of transpiration increases. If the rate of transpiration increases, the rate of absorption of water by the root increases too. The rate of transpiration is more when (a) atmosphere is dry (b) temperature is high (c) humidity is high (d) atmosphere is dry and temperature is high. Likewise, the presence of dry epidermal … One of the internal factors which affect the rate of transpiration, is (a) big size of the leaf (b) Colour of the leaf (c) sunken stomata … Thus higher the wind speed, greater is the rate of evaporation. Transpiration is the process by which water contained in plant tissues is lost to the atmosphere by the process of evaporation. 3. 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