Unit 20 Review Questions

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. Which subject studies the geography of plants?

zoogeography correct incorrect

pedology correct incorrect

phytogeography correct incorrect

cultural geography correct incorrect

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What does the term "pool" refer to in the discussion of biogeochemical cycles?

The amount of an element that is stored in liquid water that is easily accessible to organisms correct incorrect

The amount of an element that is stored in liquid water anywhere on or below the Earth's surface correct incorrect

A convenient and useful way to refer to a general location of an element correct incorrect

A pathway in which an element is physically transferred, often with chemical modification correct incorrect

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. Which of the following is usually the LEAST important when explaining the function and pathways of a biogeochemical cycle?

Atmosphere correct incorrect

Vegetation correct incorrect

Soil correct incorrect

Bedrock correct incorrect

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. The form of nitrogen that is of the greatest use to most plants is:

nitrate ions created by nitrification of ammonium ions correct incorrect

ammonium ions created by fixation of nitrogen gas correct incorrect

nitrous oxide crated by denitrification of nitrate ions correct incorrect

nitrogen gas directly from the atmosphere correct incorrect

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. The largest contributor of carbon dioxide to the atmosphere is:

breakdown of carbonate rocks correct incorrect

respiration from terrestrial biomass and soils correct incorrect

outgassing from the oceans correct incorrect

volcanic eruptions correct incorrect

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. Which human activity does the most to change the amount of carbon in the atmosphere?

Deforestation correct incorrect

Burning fossil fuels correct incorrect

Pollution runoff into oceans correct incorrect

Expansion of agricultural land correct incorrect