Transpiration

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  • Transpiration
    • result of having leaves adapted for photosynthesis
      • leaves have a LARGE SURFACE AREA
      • stomata to allow DIFFUSION
    • transpiration pull
      • water is carried up the plant
      • helps carry mineral ions, sugars and hormones
    • Temperature
      • a rise in temperature increases the kinetic energy
      • increased movement causes a rise in evaporation
      • a rise in temperature decreases the humidity of the air outside the leaf
      • a rise in temperature increases the rate of transpiration
    • Humidity
      • the humidity affects the water potential of the air
      • it affects the WATER POTENTIAL GRADIENT between the air and the leaf
      • when there is high humidity the gradient is reduced
        • so the rate of transpiration is lower
    • Air Movement
      • as water diffuses through the stomata, water vapor collects
        • this increases the water potential
      • the water potential gradient is reduuced so the rate of transpiration is reduced
      • any movement of air will break the humid layer and decrease the water potential of the air
        • this increases the water potential gradient and the rate of transpiration
        • the faster the air movement the more rapidly the humid air is removed and the greater the rate of transpiration

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