The Cycles of Matter Answers

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Which best describes a possible negative impact of irrigation of farmland?

A
Food can be produced in dry areas.
B
Increased runoff can pollute bodies of water.
C
Food can be produced through drought years.
D
Water can improve the livelihood of farmers.
4

Which statement best describes a human influence on the biogeochemical cycles?

A
increased eutrophication caused by high levels of nitrogen and phosphorous
B
increased nitrates available due to inaccurate methods of denitrification
C
increased global warming due to alternative energy sources
D
increased amount of water that is available to freshwater ecosystems
6

Which process allows water to enter the atmosphere?

A
evaporation
B
condensation
C
precipitation
D
freezing
7

Why are bacteria a necessary part of the nitrogen cycle?

A
Other living things cannot use atmospheric nitrogen.
B
Other living things cannot use the nitrogen in plants.
C
Bacteria are the main nitrogen reservoir.
D
Bacteria are the main nitrogen transpirators.
9

What process adds carbon dioxide to the air?

A
nitrogen cycle
B
water cycle
C
respiration
D
photosynthesis
10

What would happen if there were no condensation stage in the water cycle?

A
Water could not convert from a gas to a liquid.
B
Water could not convert from a liquid to a gas.
C
Water could not convert from transpiration to evaporation.
D
Water could not convert from precipitation to evaporation.

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