Photosystem I occurs before photosystem II during the light reactions
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This statement is actually incorrect. The order of the two photosystems is reversed. During the light reactions of photosynthesis, photosystem II (PSII) comes before photosystem I (PSI).
Photosystem II is responsible for capturing light energy and using that energy to break apart water molecules (photolysis), releasing oxygen and hydrogen ions. This process generates ATP which is stored temporarily in the thylakoid membrane.
Photosystem I then uses the ATP produced by Photosystem II to further energize the electrons that are captured by pigments in the PSI complex. The energetic electrons move through the electron transport chain and are eventually used to reduce NADP+ to NADPH.
In summary, PSII comes before PSI in the light reactions of photosynthesis, with PSII capturing light energy and using it to generate ATP, while PSI uses that ATP to capture electrons from pigments and ultimately produce NADPH.
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