Movement of water through roots

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  • Created by: ben
  • Created on: 01-05-13 10:02
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  • Movement of Water through Roots
    • Uptake of water by root hairs
      • dur to loss of water through Transpiration, water needs to be readilt absorbed
      • the root hairs are efficient surfaces for water exchange
        • due to long extensions & the amount of them there are, they provide a large suface area
        • they have a thin surface layer therefore having a short diffusion pathway
      • surrounded by soil solution containing minerals ions.
        • soil has high water potential whereas roots have a low water potential. therefore osmosis occurs
    • Apoplastic & Symplastic Pathway
      • Apoplastic Pathway (cell walls)
        • due to cohesive properties of water molecules, water is drawn in to cells.
          • this creates tension that draws water along the cell wall of the cells,
      • Symplastic Pathway (cytoplasm)
        • takes place across cytoplasm of cell via osmosis
        • water passes through cell walls along plasmodesma that contains cytoplasm
        • movement due to different water potentials of each cell.
    • Passage of Water into Xylem
      • water is moved into the xylem due to capsarian ***** stopping it and forcing water into living protoplast
      • due to salts and minerals being actively transported into the xylem, there is a low water potential. water floods in via osmosis
        • this force pushing the water in the xylem is called the root pressure
  • due to salts and minerals being actively transported into the xylem, there is a low water potential. water floods in via osmosis
    • this force pushing the water in the xylem is called the root pressure

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