GRE Subject Test: Biology : Understanding Chemical Cycles

Study concepts, example questions & explanations for GRE Subject Test: Biology

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Example Questions

Example Question #1 : Phosphorus Cycle

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

Possible Answers:

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

Phosphorus is cycled back into the soil through precipitation.

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 not fixed in the atmosphere by lightning.

Correct answer:

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

Explanation:

The phosphorus cycle does not contain an atmospheric phase, while both the sulfur and nitrogen cycles do.

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