- 4e + 4H O + . - . - . Light Light - Figure .
: Non-Cyclic Photophosphorylation The evolution of one oxygen molecule ( electrons required) requires quanta of light. C plants utilise ATPs and NADPH H to evolve one Oxygen molecule. To evolve molecules of Oxygen ATPs and NADPH H are utilised. C plants utilise ATPs and NADPH H to evolve one oxygen molecule.
To evolve molecules of Oxygen ATPs and NADPH H are utilised. . Dark Reaction or C3 Cycle or Biosynthetic Phase or Photosynthetic Carbon Reduction (PCR)Cycle Biosynthetic phase of photosynthesis utilises assimilatory powers(ATP and NADPH H ) produced during light reaction are used to fix and reduce carbon di oxide into carbohydrates. This reaction does not require light.
Therefore, it is named Dark reaction. Ribulose , bisphosphate (RUBP) act as acceptor molecule of carbon di oxide and fix the CO by RUBISCO enzyme. The first product of the pathway is a - carbon compound (Phospho Glyceric Acid) and so it is also called as C Cycle. It takes place in the stroma of the chloroplast.
• During Non-Cyclic electron transport two NADPH H are produced and it requires electrons. • Transportation of electrons requires quanta of light. Check your grasp! Name the products produced from Non-Cyclic photophosphorylation?
Why does PS II require electrons from water? Can you find the difference in the Pathway of electrons during PS I and PS II? . .
Chemiosmotic Theory Chemiosmosis theory was proposed by P. Mitchell ( ). According to this theory electrons are transported along the membrane through PS I and PS II and connected by Cyto- chrome b6-f complex. The flow of electrical current is due to difference in electrochemical potential of protons across the membrane.
Splitting of water molecule takes place inside the membrane. Protons or H ions accumulate within the lumen of the thylakoid (H increase to times).