Carbon cycle Knowledge-Based Download PDF

Questions

1. 1.

   In the global carbon cycle, which mechanism transports carbon from the surface ocean to the deep ocean interior primarily through the sinking of dead planktonic organisms and organic detritus?

   • A) Biological carbon pump
   • B) Carbonate weathering
   • C) Hydrothermal venting
   • D) Coastal upwelling
2. 2.

   Which of the following processes directly transfers carbon that has been sequestered in the lithosphere for millions of years into the active atmospheric carbon pool?

   • A) Subduction of tectonic plates
   • B) Anaerobic microbial methanogenesis
   • C) Combustion of fossil fuels
   • D) Chemical weathering of silicate rocks
3. 3.

   Which biological process is performed by both autotrophs and heterotrophs, releasing carbon back into the abiotic environment as carbon dioxide?

   • A) Photosynthesis
   • B) Cellular respiration
   • C) Chemosynthesis
   • D) Fossilization
4. 4.

   In the global carbon cycle, which of the following processes results in the long-term sequestration of carbon into the lithosphere rather than its rapid return to the atmosphere?

   • A) Aerobic cellular respiration by primary consumers
   • B) Fossilization of dead organic matter under high pressure
   • C) Microbial decomposition in terrestrial leaf litter
   • D) Biomass combustion during seasonal forest fires
5. 5.

   Which of the following processes directly decreases the concentration of atmospheric carbon dioxide by incorporating carbon into organic compounds?

   • A) Cellular respiration
   • B) Combustion of fossil fuels
   • C) Microbial decomposition
   • D) Photosynthesis