Which of the following is a key transfer of phosphorus in the phosphorus cycle?
Weathering of rocks releasing phosphate into soil and water
Uptake of phosphorus by plants from the atmosphere
Volcanic emissions transferring phosphorus into the air
Atmospheric fixation of phosphorus into plant-available forms
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Which of the following is not a reservoir in the phosphorus cycle?
Soil
Rocks and sediments
Atmosphere
Water bodies
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Study the following data and answer the question:
Process | Phosphorus Flow (kg/ha/yr) | Average Residence Time (years) |
Weathering of Rocks | 25 | 500 |
Runoff to Water | 15 | 10 |
Uptake by Plants | 20 | 3 |
Return by Decomposition of Organic Matter | 10 | 50 |
Sedimentation in Water Bodies | 8 | 1000 |
Which of the following processes is most likely to be the most efficient in terms of phosphorus cycling within an ecosystem?
Weathering of Rocks
Runoff to Water
Uptake by Plants
Sedimentation in Water Bodies
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