Photosynthesis Light Dependent Stage

Attachments:

• Photosynthesis light independent stage

1. For the independent stage, please check the attached mind map
2. This is a diagram of what happens the other point is the explanation
   1. Light Photon
      1. Water
         1. Oxygen
         2. Electron
            1. Photosystem 2
               1. Light Photon
               2. Electron
                  1. Electron Reciever
                     1. Electron Carriers
                        1. Photosystem 1
                           1. Electron
                              1. Electron Receiver
                                 1. NADP
                                    1. NADPH or reduced NADP
                           2. Light Photon
                        2. Hyrdrogen
         3. Hydrogen Ion
            1. Stalked Particle
               1. ATP Synthase
                  1. ATP
               2. HYdrogen Ions
            2. Move by Chemiosmosis
   2. Thylakoid Membrane is marked by the line here
      1. This line
         1. Thylakoid Space
         2. Stroma
   3. Look complicated well it is
3. Explanation
   1. A light photon hits the water in the thylakoid space causing photolysis splitting water into Oxygen which is released as a waste gas. Hydrogen ions are also released as well as an electron. The electron replaces the one lost in Photosystem 2
      1. A light photon hits photosystem 2 which excites an electron. This electron is received by an electron receiver.
         1. The electrons pass through elctron carriers dwon the electro potential gradient by a series of redox reactions. This provides for hydrogen ions to be actively transported across the thylakoid membrane.
            1. The electron carries onto photosystem 2 to replace the lost electrons. Another light photon hits photosystem 2 exciting an electron.
               1. This electron is received by an electron receiver which passes it onto NADP
                  1. The hydrogen ions here move by chemiosmosis through the stalked particles. This causes ATPsynthase to spin phosphorylating ADP + Pi into ATP. The hydrogen ions then move onto NADP completing the reduction forming reduced NADP or NADPH
   2. This is colour coded to show you which section is talking about what
4. Other things to note
   1. This is called non-cyclic phosphorylation. This is because it is not a cycle (the water is not replaced so it cannot be a cycle as well as other substances) and is using the sun (photo bit). We are also phosphorylating ATP.
      1. The products of this are Oxygen, NADPH and ATP
   2. Cyclic phosphorylation is just the photosystem on part up to the electron receiver. However this electron moves to the electron carries shown by the dotted line. This means ATP is released but no NADPH or oxygen