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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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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