Here's why:
* Not all light is usable: Plants mainly use red and blue wavelengths of light for photosynthesis. Other wavelengths are either reflected or absorbed as heat.
* Energy loss in reactions: Photosynthesis involves multiple steps, and energy is lost as heat during each step.
* Environmental factors: Factors like temperature, water availability, and CO2 concentration can further limit the efficiency of photosynthesis.
So, while plants are incredibly efficient at capturing light energy, the overall percentage of light energy converted to chemical energy is still quite low.
