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Oxygen is evolved in Photosystem II, not Photosystem I.
Ref: NCERT Class 11 Biology Chapter 11: Photosynthesis in Higher Plants Light Reaction - Photosystems Electron Transport Photophosphorylation
Photosystem I helps in reducing NADP+ to NADPH during the light reactions.
Ref: NCERT Class 11 Biology Chapter 11: Photosynthesis in Higher Plants Light Reaction - Photosystems Electron Transport Photophosphorylation
In cyclic photophosphorylation, electrons cycle within Photosystem I, producing ATP without NADPH or oxygen evolution.
Ref: NCERT Class 11 Biology Chapter 11: Photosynthesis in Higher Plants Light Reaction - Photosystems Electron Transport Photophosphorylation
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