Plant water relation; Chapter 9

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Plant water relation; Chapter 9
2012-02-06 20:40:32

day 6
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  1. Osmosis
    ability of water to move through the membrane.

    • *water inside cells makes it turgid
    • *lose/gain water across cell membrane and vacuole
    • *cell wall remains the same "up to a point"
  2. Plasmolysis
    -specialized osmosis in plant cells

    -water loss causes plants to become "flaccid or wilted"
  3. (3) Route of water
    1. Soil > Diffusion> Root

    • 2. Epidermis> Endodermis> Xylem
    • * 3 types
    • 3. Root > stem > leaf > air
    • * cohesion-tension theory
  4. (route of water) Soil > Diffusion > Root
    Soil (outside of root) > Diffusion > Root (epidermis/root hairs)
  5. Diffusion
    • movement of water from higher to lower concentration
    • *reaches equilibrium eventually
  6. (route of water) Epidermis (root hair) > Endodermis > Xylem
    *Outside of root to the Center of the root*

    -either by symplasty or apoplasty
  7. Symplasty
    -move water and nutrients across cell membrane

    -from higher and lower concentration
  8. Apoplasty
    -water moves between cells in intercellular spaces between the cell walls

    *faster method
  9. Endodermis > Symplasty > Xylem
    -endodermis regulates what goes into the xylem

    -caspirian strip causes all material to move into cells by symplasty
  10. Root > Stem > Leaf > Air
    (moves via xylem) > ( moves out of stomata and guard cells)
    by the cohesion-tension theory
  11. 3 elements Cohesion-tension theory
    -transpiration pull


  12. (Cohesion-tension theory) Transpiration pull
    -pulls water up plant from leaves

    -major force moving water up a plant

    -transpiration: loss of water from leaves via stomatas of guard cell.
  13. (Cohesion-tension theory) Cohesion
    -ability of water to "stick to itself"
  14. (Cohesion-tension theory) Adhesion
    ability of water to stick to other materials

    *explains how water moves up a tube or pipe