Discussion
From the list given below, identify the organism type in the biological pump that takes up carbon dioxide from the atmosphere into the ocean.
Answer: C
The organisms are Phytoplankton.
The biological pump begins with photosynthesis. Phytoplankton in the sunlit surface layer fix dissolved CO2 into organic matter, which lowers the surface water's CO2 and lets more be drawn in from the atmosphere. Part of that carbon then sinks to depth as dead cells, faecal pellets and aggregates.
Zooplankton, fish and radiolarians feed on and repackage that organic carbon, and help move it downward, but they respire CO2 rather than taking it up from the air. They are consumers in the pump, not the primary producers that draw CO2 in.
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