The Cycles of Matter Answers

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Which are limiting nutrients for plant growth?

A
water and nitrogen
B
nitrogen and carbon
C
carbon and phosphorus
D
phosphorus and nitrogen
2
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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
5

Which of the following would be a result of eutrophication of a lake?

A
undergrowth of water plants
B
hypoxia, or low levels of oxygen
C
decreased decomposition
D
inactivity of fertilizers
8

What process adds carbon dioxide to the air?

A
nitrogen cycle
B
water cycle
C
respiration
D
photosynthesis
9

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.
10

Which process allows water to enter the atmosphere?

A
evaporation
B
condensation
C
precipitation
D
freezing

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