A) Photosynthesis
B) Respiration
C) Fossil fuel combustion
D) All above
Correct Answer: D
Solution :
Carbon enters the biotic system through photosynthesis. In photosynthesis green plants utilize \[C{{O}_{2}}\] and incorporate the carbon of \[C{{O}_{2}}\] in Glucose. In respiration, burning of biomass and fossil fuels release a lot of\[C{{O}_{2}}\]. Burning of fossil fuels adds \[6\times {{10}^{12}}kg\]of carbon into atmosphere.
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