Test: GRE Subject Test: Biology

1.

The phosphorus cycle is fundamentally different from the nitrogen and sulfur cycles. How so?

Phosphorus is not taken up by plants and is a strictly inorganic cycle.

Phosphorus is not fixed in the atmosphere by lightning.

Phosphorus does not enter the cycle from weathering of sediments and parent material.

The phosphorus cycle does not include a gaseous phase, resulting in no significant quantities of atmospheric phosphorus.

Phosphorus is cycled back into the soil through precipitation.

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