Exchange in plants

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  • Created by: siobhan
  • Created on: 05-05-13 12:32
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  • Exchange in plants
    • Gases diffuse in and out of leaves through tiny holes called stomata
      • The size of the stomata is controlled by the guard cells which surround them
      • These gases are
        • Oxygen- needed for respiration and is a waste product of photsynethesis
        • Carbon dioxide- needed for photosynthesis and is a waste product of respiration
          • the movement of these gases depends upon which process is happening the most quickly
            • Oxygen- needed for respiration and is a waste product of photsynethesis
    • Plants also lose water vapour through the stomata due to evaporation in the leaves
    • Leaves are flat and very thin so the gases do not need to diffuse very far. There are also internal air spaces
    • Water and mineral ions are taken up by the roots. Root hair cells increase the surface area of roots for the absorption of water and mineral ions
    • If plants lose water faster than it is replaced by the roots, the stomata can close to prevent wilting

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