Water Uptake and Loss in Plants (Page 27)

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  • Created by: alexda
  • Created on: 13-01-15 18:49
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  • Water Uptake and Loss in Plants
    • Transpiration is caused by the evaporation and diffusion of water from inside the leaves.
      • This creates a shortage of water in the leaf and so more water is absorbed from the rest of the plant through the xylem vessels to replace it.
        • This in turn means more water is absorbed from the roots and so there is a constant transpiration stream of water through the plant.
          • The stomata in the leaves causes evaporation because the concentration of water in the air is less than the concentration of water in the leaves.
            • The transpiration stream provides the plant with a constant supply of water for photosynthesis.
    • Root hairs absorb water by osmosis. They are adapted to this function:
      • Root hair cells are very elongated microscopic hairs which enable a big surface area for absorbing water from the soil.
      • There is a higher concentration of water in the soil than inside the plant so the water enters the root hair cell by osmosis.

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