The numbers of the photosystems indicate the order in which the photosystems were discovered, not the order in which they occur. In other words, photosystem 1 does not happen first. The second stage of photosynthesis uses energy from the first stage to make sugars. This stage is called light independent because it does not use light, but uses the energy from photosystem 2. Both photosystems happen in the chloroplast, but stage one happens in the thylakoid membrane and stage two in the stroma. In stage 2, many things happen.
The Calvin cycle is part of light independent reactions.
1. The first thing that happens in the calvin cycle is carbon dioxide enters the cycle
2. Then energy is added from ATP and NADPH
3. Next a high energy three carbon molecule leaves the cycle
4. Remaining carbons continue to cycle
The Calvin cycle is part of light independent reactions.
1. The first thing that happens in the calvin cycle is carbon dioxide enters the cycle
2. Then energy is added from ATP and NADPH
3. Next a high energy three carbon molecule leaves the cycle
4. Remaining carbons continue to cycle