Answer: light intensity.
- A light intensity
- B carbon dioxide
- C soil water
- D chlorophyll
Correct answer: A. light intensity
Explanation: When light is scarce, light intensity becomes the limiting factor.
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.