AnswersPT-GSE Environmental Science B-IC – 81The Cycles of Matter

Biogeochemical Cycles in Ecosystems Answers

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1
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Why are plants important to the carbon cycle?

A
Plants remove carbon from the soil to help them convert nitrogen to a usable form.
B
Plants remove carbon from the atmosphere to help them convert nitrogen to a usable form.
C
Plants remove carbon from the soil to help them make glucose.
D
Plants remove carbon from the atmosphere to help them make glucose.
2
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Which statements describe characteristics of Earth's geosphere? Select three options.It is made up of living things.It is mostly solid.It includes liquid water.It includes Earth's surface.It includes Earth's interior.It is made up of gases and airborne particles.

A
It is made up of living things.
B
It is mostly solid.
C
It includes liquid water.
D
It includes Earth's surface.
E
It includes Earth's interior.
F
It is made up of gases and airborne particles.
3

Which statements describe the importance of the nitrogen cycle to living things? Select two options.It provides a source of water.It helps cells make proteins.It provides a form of usable nitrogen.It removes carbon dioxide from the atmosphere.It destroys harmful bacteria.It helps cells make glucose.

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.
4

heliumcarbonzincpolonium

A
helium
B
carbon
C
zinc
D
polonium
5

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.
6

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.
7

How do animals get nitrogen?

A
They break down glucose molecules into nitrogen.
B
They convert carbon to nitrogen during fixation.
C
They eat it in plants and other animals.
D
They breathe it in from the atmosphere.
8

Which process plays an important role in the cycling of both carbon and nitrogen?

A
photosynthesis
B
transpiration
C
decomposition
D
respiration
9

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
10

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

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