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Cycles of Matter — Quiz Answers

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1
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After Gerry mows his lawn, he often puts the grass clippings into his flower garden. How will this affect his garden?

A
It will decrease the amount of carbon in the soil and decrease the amount of carbon dioxide released by decomposers.
B
It will increase the amount of carbon in the soil and increase the amount of carbon dioxide released by decomposers.
C
It will decrease the amount of carbon in the soil and increase the amount of carbon dioxide released by decomposers.
D
It will increase the amount of carbon in the soil and decrease the amount of carbon dioxide released by decomposers.
2
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Which best compares the roles of nitrogen-fixing bacteria and certain decomposers in the nitrogen cycle?

A
Both organisms convert nitrogen-containing compounds into free nitrogen.
B
The bacteria convert free nitrogen into nitrogen-containing compounds, while the decomposers convert nitrogen-containing compounds into free nitrogen.
C
The bacteria convert nitrogen-containing compounds into free nitrogen, while the decomposers convert free nitrogen into nitrogen-containing compounds.
D
Both organisms convert free nitrogen into nitrogen-containing compounds.
3

Which processes result in the release of carbon? Choose three correct answers.

A
The remains of consumers are broken down by soil decomposers.
B
Producers take in carbon dioxide.
C
The remains of producers are broken down by decomposers.
D
Animals break down food molecules to obtain energy.
E
Producers make sugars and starches.
6

Which process occurs when bacteria converts nitrogen gas to a usable form?

A
fixation
B
condensation
C
decomposition
D
transpiration
7

How is the nitrogen cycle important to humans?

A
It produces nitrogen compounds that humans can breathe.
B
It produces free nitrogen that can remove carbon dioxide from the atmosphere.
C
It converts nitrogen into a form that humans can obtain by absorbing it through their skin.
D
It converts nitrogen into a form that humans can obtain by eating other organisms.
8

Cleo has a vegetable garden and wants to increase the amount of nitrogen in the soil. How can she most likely do this?

A
reduce the number of decomposers that live in the soil
B
decrease the amount of fertilizers she uses
C
add several soybean plants to her garden
D
harvest the vegetable plants continuously

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Cycles of Matter — Quiz Answers — Physical…