Photosynthesis occurs in two phases. Light Dependent Reaction and The Calvin Cycle (Light In-Dependent reaction) The First phase is The Light Dependent Reaction. This process occurs in the Thylakoids of Chloroplast that is located inside of cells. The light-dependent reaction occurs on the thylakoid membrane and the Calvin Cycle occurs in the stroma.
Steps #3 & #4
3. During these processes, the electron looses energy, so it goes to Photosystem 1 and is re-energized with light.
4. From there the electron travels to a final protein called ferrodoxin. Ferrodoxin transfers the electrons to the electron carrier NADP+, forming NADPH and sending it to the calvin cycle.
The Calvin Cycle
- RUBP meets up with carbon that came through the pores of plants. (stomata)
- Then it forms PGA.
- After that ATP and NADPH is added for energy and electrons forming G3P.
- From there, some is formed into sugars, but only a small percentage.
- The remaining G3P hits an enzyme called rubisco forming it back into RUBP.