Photosynthesis

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  • Photosynthesis
    • Overview
      • Takes place in chloroplast
        • Carbon dioxide+water forms Glucose+Oxygen, with the addition of light energy from the sun
      • Three main stages
        • LIR
        • LDR
      • Chloroplasts
        • Grana- stacks of thylakoids- site of light dependent reaction
        • Stroma- site of light independent reaction. Fluid filled matrix
    • Light Dependent Reaction
      • Oxidation and reduction
        • Reduction- loss of oxygen and gain of electrons
        • Oxidation- combine with oxygen and loses electrons
      • Making ATP
        • Chlorophyll absorbs energy- electrons increase in energy level. Leave chlorophyll
          • Taken up by electron carrier and passed down chain of oxidation-reduction reactions. EC=reduced
            • Energy is lost as they are passed along this chain. This energy is used to combine ADP and inorganic phosphate, forming ATP
      • Photolysis of water
        • Chlorophyll needs to get electrons back. Light energy is used to provide electrons, protons and oxygen from water
          • Electrons given back to chlorophyll, oxygen used in respiration, protons used to reduce NADP- form NADPH
    • Light Independent Reaction
      • The Calvin Cycle
    • Factors affecting rate
      • Light Intensity
      • Temperature
      • Carbon dioxide concentration
  • Takes place in chloroplast
    • Carbon dioxide+water forms Glucose+Oxygen, with the addition of light energy from the sun
  • Capturing light- chlorophyll
    • Three main stages
      • LIR
      • LDR
  • Taken up by electron carrier and passed down chain of oxidation-reduction reactions. EC=reduced
    • Energy is lost as they are passed along this chain. This energy is used to combine ADP and inorganic phosphate, forming ATP
  • Carbon dioxide from atmosphere combines with RuBP
    • The Calvin Cycle
    • Produces two molecule of 3-carbon GP
      • ATP and NADPH from LDR are used to reduce GP to triose phosphate (TP)
        • NADP reformed and goes back to LDR
          • Some TP is converted into organic substances
            • Most TP is used to regenerate RuBP using ATP from LDR
  • Produces two molecule of 3-carbon GP
    • ATP and NADPH from LDR are used to reduce GP to triose phosphate (TP)
      • NADP reformed and goes back to LDR
        • Some TP is converted into organic substances
          • Most TP is used to regenerate RuBP using ATP from LDR

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