Multiple Choice
Which of the following best defines primary production in the context of photosynthesis?
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9. Photosynthesis
Introduction to Photosynthesis
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Photosynthesis and respiration are the driving forces behind which biogeochemical cycle?
A
Nitrogen cycle
B
Carbon cycle
C
Phosphorus cycle
D
Sulfur cycle
Verified step by step guidance1
Understand the role of photosynthesis and respiration in the movement of carbon through ecosystems. Photosynthesis captures carbon dioxide (CO₂) from the atmosphere and converts it into organic molecules, while respiration releases CO₂ back into the atmosphere.
Recall that the carbon cycle involves the exchange of carbon between the atmosphere, biosphere, hydrosphere, and geosphere, driven by processes like photosynthesis, respiration, decomposition, and combustion.
Eliminate the incorrect options by considering the processes involved: The nitrogen cycle primarily involves nitrogen fixation, nitrification, and denitrification, which are unrelated to photosynthesis and respiration.
Similarly, the phosphorus cycle focuses on the movement of phosphorus through rocks, soil, water, and organisms, and the sulfur cycle involves sulfur compounds, neither of which are directly driven by photosynthesis and respiration.
Conclude that the correct answer is the carbon cycle, as photosynthesis and respiration are central to the movement of carbon within ecosystems.
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