Photosynthesis

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  • Created by: wanjikar
  • Created on: 10-02-22 19:41
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  • Photosynthesis
    • Light Dependent Reaction
      • needs light energy which is used to:
        • make ATP from ADP and P-                     phosphorylation
        • making reduced NADP from NADP
        • splitting water into protons- photolysis
      • occurs in the thylakoid membrane
      • the light energy is absorbed by photosynthetic pigments and converted to chemical energy
      • Stages
        • 1.) Light energy excites electrons in chlorophyll
        • 2.) Photolysis of water produces protons
        • 3.) Energy from the electrons make ATP and red. NADP
    • Light Independent Reaction
      • relies on the products of the light dependent reaction
        • the ATP and red. NADP supply energy and H to make glucose and CO2
      • occurs in the stroma of the chloroplasts
      • makes triose phosphate and ribulose bisphosphate
        • triose phosphate can maje glucose and other organic substances
      • Stages of the Cycle
        • 1.) CO2 is combined with ribulose bisphosphate to form 2 molecules of glycerate 3-phosphate
          • CO2 enters through the stomata diffusing into the stroma where it combines with ribulose bisphosphate
          • ribulose bisphosphate carboxylase catalyses the reaction between CO2 and ribulose bisphosphate
        • 2.) ATP and reduced NADP are required for the reduction of GP to triose phosphate
        • 3.) Ribulose bisphosphate is regenerated
          • 1/6 of TP is used to regenerate RuBP
    • Limiting Factors
      • Light Intensity
        • the higher the light intensity, the more energy it provifes
      • Temperature around 25 C
        • involves enzymes which are inactive at 10 C and denature over 45C
      • CO2 at 0.4%
        • any higher and the stomata close

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