Non - Cyclic Photophosphorylation - LDS

Stage 1

Light harvested by accessory pigments in PS2 and transferred to chlorophyll A

2

Electrons are excited in chlorophyll A and are transferred to the first electron carrier. The electron carrier is reduced dd and chlorophyll A is oxidised

3

Photolysis occurs to replace the los electrons at PS2

2H2O → o2 + 4H+ + 4e-

requires an enzyme and light

4

Electrons transferred between electron carriers down the ETC through a series of redox reactions

The electrons lose energy which is transferred to the ECs

5

Electron carriers use energy to pump H ions from the storm to the thylakoid space

this forms a proton gradient and lowers the PH of the thylakoid space

6

Protons move by facilitated diffusion through ATP synthesise down the electrochemical gradient

7

chemiosmosis occurs

movement of protons through ATP synthesise provides energy for the phosphorylation of ATP

8

light excites the antenna complex of PS1 and photons are passed to Chlorophyll A

electrons in chlorophyll A are excited

9

excited electrons and protons in the stroma reduce NADP to NADPH which is needed for the LIS