Photosynthesis- Part 2

Previously in Photosynethsis

• Plants are Photoautotrophs.
• The process of photosynethsis takes place in the chloroplasts. 
• Within the cholorplasts are 2 main districts the stroma and the grana. 
• The stroma is home to the light dependent stage. 
• The grana is home to the light independent stage. 
• Within the light dependent stage, water is split into hydrogen ions, elctrons and oxygen. 

Photophosphorylation: 

Photophosphorylation is the process of which ATP is made from ADP and Pi (inorganic phosphate) in the presence of light. Now there are 2 different types of photophosphorylation, cyclic and non-cyclic which both use different photosystems. 

There are 2 main photosystems which are used in the 2 different types of photophosphorylation,

Photosystem 1 (P700) and Photosystem 2 (P680), the 700 and 680 come from the optimum light wave length that each one can absorb. 

Cyclic Photophosphorylation: 

- This only uses PS1. For this explanation we need to imagine a night out (it…