Gas and Solute Exchange

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  • Created by: Jasmin
  • Created on: 07-04-13 18:46
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  • Gas and Solute Exchange
    • Diffusion
      • Particles move from an area of high concentration to an area of low concentration
    • Exchange surfaces are ADAPTED to maximise effectiveness
      • Thin, short distance to diffuse
      • Large SA, lots of substances diffuse at once
    • Gas Exchange in plants
      • CO2 - diffusion
        • Internal air spaces, leaves flattened shape increase SA
        • Thin leaves so the distance CO2 has to diffuse from the outside air to photosynthesising cells is small
      • Stomata
        • Can be opened when the plant needs to allow air into the leaves
        • Size controlled by guard cells
          • Close stomata if plant is losing water faster than it is being replaced by the roots

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