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Water potential

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Water potential Using your knowledge from KS4 and your understanding of water potential write down how water travels into a root. (remember a plant cells cytoplasm ... – PowerPoint PPT presentation

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Title: Water potential


1
Water potential
  • Using your knowledge from KS4 and your
    understanding of water potential write down how
    water travels into a root.
  • (remember a plant cells cytoplasm contains some
    salts and sugars)
  • Swap your work with your neighbour and peer
    assess
  • Define water potential (Grade E)

2
  • As water enters the root hair cell, this raises
    its water potential, so it is now higher (less
    negative) than that of its neighbouring cell.
    This means water passes from the root hair cell
    to the cortex cell next to it. This process is
    repeated across the root, until the water enters
    the xylem.

3
The 3 pathways for water to move through the root
of a plant
4
Pathways through the root
  • 1)Symplast pathway goes through living parts of
    cells cytoplasm. The cytoplasm of neighbouring
    cells connect through plasmodesmata (small
    channels in cell walls)
  • 2)Apoplast pathway goes through non-living
    parts of cells-cell wall
  • 3)Vacuolar pathway similar to symplast but it
    can enter the vacuoles as well
  • Define the three pathways that water can take
    through cells
  • (Grade D C)

5
Water can only cross the root by the apoplast
pathway until it meets the endodermis!!!
6
Why is the endodermis and Casparian strip the
end of the apoplast pathway?
  • Suberin in the Casparian strip stops water and
    mineral ions continuing along the apoplast
    pathway, so they have to enter the cytoplasm,
    through the cell membrane, taking the symplast
    pathway.

7
Transport through the root
  • www.youtube.com/watch?vTWNtXw-MWtE
  • Label pathways on your root hair structure
  • Explain the vacuolar pathway
  • Describe in terms of water potential, the
    movement of water between plant cells and plant
    cells and their environment (Grade C B)
  • To predict the pathway that water will travel
    through the cells , using diagrams, (Grade B A)
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