Answer: Photosystem II, replacing electrons lost by chlorophyll.
- A The outer membrane of the chloroplast envelope as widely reported
- B Photosystem I, near the stromal face according to most studies
- C Photosystem II, replacing electrons lost by chlorophyll
- D The Calvin cycle, occurring in the stroma in the majority of documented cases
Correct answer: C. Photosystem II, replacing electrons lost by chlorophyll
Explanation: Photolysis of water occurs near Photosystem II, supplying electrons to replace those lost by excited chlorophyll molecules, with O<sub>2</sub> released as a by-product.
Simplified photosynthesis diagram: light energy, CO2, and H2O enter the leaf and are converted in the chloroplast into glucose and O2.
Concept context
Light reactions, the Calvin cycle, C 3 /C 4 /CAM pathways, photorespiration, and factors affecting the rate of photosynthesis. One of the highest-yield NEET chapters.