Answer: carbon dioxide.
- A carbon dioxide
- B pure oxygen
- C pure nitrogen
- D pure hydrogen
Correct answer: A. carbon dioxide
Explanation: Plants take in carbon dioxide to build sugars.
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.