light dependent reaction

• light wavelengths involvement in reaction?

  light hits PSII molecule, energy causing 2 electrons to be excited

  • increased energy level and electrons leave PSII
• where do electrons move after PSII?

  electrons picked up by first electron carrier (electron transport chain) within chain, series of redox reactions take place.
• what happens during redox reactions?

  energy in electrons falls and energy is lost, being used in photophosphorylation (synthesis of ATP in stroma)
• what happens in the PSI molecule?

  lightwaves also excite the electrons and leave, continuing electron transport chain. electrons from PSII molecule replace those lost from the PSI molecule.
• photolysis?

  splitting of water, in thylakoid space. half an oxygen is released.
• what happens when electrons reach the end of the transport chain?

  accompanied by the co-enzyme NADP, they accept the Hydrogen ion from photolysis to create NADPH. ATP and NAPDH are then used in the light independent reaction.
• photophosphorylation?

  ADP + Pi -> ATP (energy used to create reaction)
• what is needed in the reaction?

  water, light, carbon dioxide, temperature
• where does light dependent reaction take place?

  thylakoid membrane