What percentage of light reaching the earth is used in photosynthesis?
Correct answer: D. 1%
- A. 25%
- B. 10%
- C. 5%
- D. 1%
Explanation
Only about 1% of the sunlight reaching Earth is captured by green plants and converted into chemical energy through photosynthesis. Most incoming light is reflected, transmitted or absorbed without being stored as plant biomass. Students may choose c because 5% sounds plausible, but the standard ecological estimate is approximately 1%.
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