Multiple Choice
Which of the following processes is specifically part of the nitrogen cycle?
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52. Ecosystems
Biogeochemical Cycles
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The phosphorus cycle differs from other biogeochemical cycles in that:
A
it is primarily driven by photosynthesis and respiration.
B
it relies heavily on nitrogen-fixing bacteria.
C
it does not include a significant atmospheric component.
D
it involves the rapid cycling of phosphorus through the atmosphere.
Verified step by step guidance1
Understand the phosphorus cycle: The phosphorus cycle is unique among biogeochemical cycles because it does not include a significant atmospheric component. Unlike cycles such as the carbon or nitrogen cycles, phosphorus does not exist in a gaseous form under normal conditions.
Identify the primary reservoirs of phosphorus: Phosphorus is mainly found in rocks, soil, and sediments. Weathering of rocks releases phosphate ions (PO₄³⁻) into the soil and water, where it becomes available to organisms.
Examine the movement of phosphorus: Phosphorus is absorbed by plants from the soil in the form of phosphate ions. It then moves through the food chain as animals consume plants and other animals.
Consider the return of phosphorus to the environment: When organisms die or excrete waste, phosphorus is returned to the soil or water through decomposition. This process allows it to be reused by plants and other organisms.
Compare with other cycles: Unlike the carbon or nitrogen cycles, which involve significant atmospheric components (e.g., CO₂ or N₂), the phosphorus cycle is primarily terrestrial and aquatic, with no major gaseous phase.
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