- A Photosystem II
- B Photosystem III
- C Photosystem IV
- D Photosystem V
Correct answer: A. Photosystem II
Explanation: Photosystems I and II work together in the light reactions.
Concept context
Light reactions, the Calvin cycle, C3/C4/CAM pathways, photorespiration, and factors affecting the rate of photosynthesis. One of the highest-yield NEET chapters.