Answer: water.
- A water
- B carbon dioxide
- C glucose
- D the soil
Correct answer: A. water
Explanation: The oxygen comes from the splitting of water, not from CO₂.
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.