In the global biogeochemical carbon cycle, which natural process directly extracts carbon dioxide from the atmosphere to store carbon in organic compounds?
Answer and explanation
Correct answer: D. photosynthesis carried out by terrestrial green plants and marine phytoplankton
- Step 1: Atmospheric carbon dioxide (CO₂) is drawn into living systems through photosynthesis: 6CO₂ + 6H₂O -> C₆H₁₂O₆ + 6O₂. Step 2. Respiration, combustion, and volcanic outgassing release CO₂ into the atmosphere. Answer: photosynthesis carried out by terrestrial green plants and marine phytoplankton. Why not the others: Volcanic outgassing, decay, and fuel combustion all release carbon into the atmosphere.
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