Photosynthesis

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  • Photo- synthesis
    • 6CO2 + 6H20  --> C6H12O6 + 602
    • Adaptions of plants for p/s
      • Stomata
        • Underneath the leaf and able to open and close
          • Gases diffuses through air spaces to cells. Oxygen  out- CO2 enters. Close at night to stop CO2 loss
      • Xylem- attached to root hair cell
        • Water diffuses into the xylem from the soil and the roots. It is then transported around the plant
      • Phloem
        • Carries food away from the leaf after photo-synthesis
          • Takes glucose to roots, fruits, seeds and buds
      • Chlorophyll
        • Absorbs sun light and energy
    • Uses of glucose in a plant
      • Used for respiration
      • Converted into insoluble starch for storage
      • Used to produce fats or oils for storage
      • Used to produce cellulose, strengthen cell walls
    • Limiting factors
      • Light intensiity
        • CO2  Conc.
          • Temperature
      • The factor that is furthest from its optimum level controls the rate of p/s
    • Mineral nutrition
      • Nitrate- NO3-
        • Makes amino acids, proteins, chlorophyll, DNA and others
        • Stunted growth, older leaves turn yellow
      • Magnesium- Mg 2+
        • Needed to make chlorophyll
        • Leaves turn yellow
    • P/s and respiration
      • Hight light intensity- p/s>resp.
        • CO2 from resp used up quickly- low CO2 conc.
      • Low light intensity- p/s< resp.
        • CO2 from resp. isn't used- high CO2 conc.
      • P/s only during day
        • Resp. all the time
    • Tests
      • Starch test
        • p- blue/black n- stays golden
      • Effect of  LI on balance between p/s and resp
        • Purple -CO2 Red neutral Yellow +CO2

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