AnswersFL-2001340-Environmental Science BHuman Impact on the Environment

Week 6: Biogeochemical Cycles in Ecosystems Answers

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1
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Which statement describes a negative consequence of humans’ use of excess water?

A
It allows food to be produced in dry areas.
B
It increases runoff, which carries fertilizers.
C
It enables food to be produced in drought years.
D
It results to water not being recycled.
2
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Which process plays an important role in the cycling of both carbon and nitrogen?

A
photosynthesis
B
transpiration
C
decomposition
D
respiration
3

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A
helium
B
carbon
C
zinc
D
polonium
4

Humans affect Earth in many ways. The use of fossil fuels, the clear-cutting of forests, and controlled burns can affect the carbon cycle.Which process can help counteract these human interactions?

A
photosynthesis
B
respiration
C
decomposition
D
transpiration
5

What is one negative effect of human influence on cycles of matter?

A
decreased soil nitrogen due to the harvesting of crops
B
decreased amount of carbon in the atmosphere due to deforestation
C
increased global warming due to the use of alternative energy sources
D
increased amount of water that is available to freshwater ecosystems
6

A student wants to learn how plants and animals interact with one another in an ocean habitat. Which of Earth's spheres should the student study the most?

A
the geosphere
B
the atmosphere
C
the hydrosphere
D
the biosphere
7

Why are bacteria needed in 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 convert nitrogen gas into oxygen.
8

A scientist is investigating how the amount of available water affects plant growth in a rainforest. Although all of Earth's spheres are interconnected, which of Earth’s spheres does the scientist’s investigation focus on?

A
the geosphere and the hydrosphere
B
the hydrosphere and the biosphere
C
the biosphere and the geosphere
D
the geosphere and the atmosphere
9

Which statements describe the importance of the nitrogen cycle to living things? Select two options.

A
It provides a source of water.
B
It helps cells make proteins.
C
It provides a form of usable nitrogen.
D
It removes carbon dioxide from the atmosphere.
E
It destroys harmful bacteria.
F
It helps cells make glucose.
10

What protects Earth's surface?

A
the atmosphere
B
the hydrosphere
C
the geosphere
D
the biosphere

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