Light Dependent Reaction

• LDR occurs in the thylakoid membrane of the grana
• Photolysis = H2O -> 1/2 O2 + 2e- + 2H+
• Oxygen from photolysis is used in respiration or diffuses through stomata
• Electrons in photolysis used in electron transfer chain / replace electrons in chlorophyll
• H+ ions from photolysis used in reducing NADP
• Photoionisation is the absorption of light energy from photons in the chlorophyll, exciting 2e- and ionising chlorophyll
• Chemiosmosis is the process of electrons passing through a series of proteins in the thylakoid membrane, undergoing redox reactions
• In chemiosmosis, energy is released and used to pump H+ ions from the stroma into the thylakoid membrane, creating an electrochemical gradient
• The electrochemical gradient in chemiosmosis cause protons to pass through ATP Synthase changing in shape, resulting in ATP production and H+ entering the stroma
• The H+ ions in the stroma from chemiosmosis combine with the co-enzyme NADP to become reduced NADP, which also acts as the final electron accepter from electron transfer chain