The Light stage

• Products - ATP and NADPH, Oxigen
• Equation - 6CO2 + 6H2O = C6H12O6+6O2
• Pathway 1 - cyclic electron flow

  1. light energy absorbed by chlorophyll
  2. Electrons emitted through carriers
  3. Energy release to make ATP
  4. Electron return to same chlorophyll
• Pathway 2 - non -cyclic energy flow

  1. Light energy absorbed in chlorophyll
  2. Energised electrons emitted and passed to NADP+ forming NADP-
  3. NADP- combines with H+ protons = NADPH
  4. H2O split in H+ electrons and oxygen
  5. Electrons go to chlorophyll to replace its electrons
  6. Energy from these electrons used to make ATP
• Dark Stage

  1. NADPH supplies electrons and H+
  2. ATP provides energy
  3. CO2 reduced to a carbohydrate (glucose)
  4. Nadp regenerated