plant biology

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  • Created by: Jess
  • Created on: 07-05-13 19:47
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  • Plant Biology
    • Transpiration
      • 1) plants take up water from roots.
        • 2) water passes through the plant to the leaves
          • 3) water evaporates from the leaf cells
            • 4) water vapour diffuses out of the stomata
    • Exchange
      • Gases diffuse in and out of the leaves through the stomata.
        • Oxygen- waste product of photosynthesis Carbon dioxide- needed for photosynthesis
      • Plants lose water through evaportion through leaf cells and diffusion through the stomata.
        • Leaves are flat so they dont need to diffuse very far.
      • Water and minerals are taken up by the root, root hair cells increase surface area,
      • stomata lets carbon dioxide in for photosynthesis at the same time the plant is losing water vapour through the stomata- the roots need to absorb more water to prevent wilting.
    • Wilting of the whole plant can reduce water loss, the leaf collapses and hangs down which reduces surface area.
    • Guard cells can close to prevent water loss.
    • Conditions which increase the rate or evaportaions will increase the rate of transpiration.


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