Biology-Chapter 32(examII)

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Author:
AmyHulin
ID:
203838
Filename:
Biology-Chapter 32(examII)
Updated:
2013-02-27 14:02:07
Tags:
Biology
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Description:
Plant Nutrition and Transport
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  1. plant gets from air, uses for photosynthesis
    CO2- source of plant nutrients
  2. through soil, inorganic substance obtained in greatest quantity of soil
    H2O-source of plant nutrients
  3. gets it from air, process of cellular respiration
    O2-source of plant nutrients
  4. takes it by soil, phosphorous-nitrogen-(protein, ATP, chlorophyll)
    minerals-source of plant nutrients
  5. increase surface area of root, allow ability to extract water and minerals from soil, increase efficiency
    root hairs
  6. water and selected solutes cross the cell wall and plasma membrane of an epidermal cell (usually the root hair)
    -cells within the root are interconnected by plasmodesmata
    -once inside the epidermal cell, the solution can move inward from cell to cell without crossing plasma membranes, through to the roots epidermis
    intracellular route for water/nutrients
  7. solution moves inward within hydrophilic walls and extracellular spaces of the roots cells, not entering cytoplasm of epidermis or cortex cells
    -solution does not cross any plama membranes so there is no selection of solutes until solution reaches endodermis
    extracellular route for water/nutrients
  8. waxy barrier stops water and solutes from entering xylem through cell walls, forcing them to cross the plasma membrane into endodermal cell
    -no solutes enter the vascular tissue unchecked, so all must pass through at least one checkpoint
    casparian strip of extracellular route
  9. pushing process, ions are pumped by active transport into xylem , roots endodermis holds the ions there
    -ions accumulate in the xylem, water enters by osmosis pushing xylem sap upward
    root pressure- movement of water up xylem vessels
  10. pulling process, loss of water from the leaves and aerial parts of plant by diffusion/evaporation, moving large volumes of water from roots to shoots
    transpiration-movement of water up xylem vessels
  11. sticking together of molecules of the same kind (H2O), part of transpiration
    cohesion
  12. sticking together of molecules of differend kinds (H2O, cellulose molecules that line xylem cells), part of transpiration
    adhesion
  13. transpiration exerts a pull on a tense, unbroken chain of water molecules held together by cohesion and helped upward by adhesion
    transpiration-cohesion-tension mechanism

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