Cycles of Matter Answers
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Some bacteria live in the roots of plants like soybeans and peas.
A
to absorb nitrogen-containing compounds from the soilB
to release free nitrogen into the atmosphereC
to break down nitrogen-containing compounds in dead organismsD
to convert free nitrogen into usable nitrogen2
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The diagram illustrates part of the carbon cycle.
A
A consumer is obtaining carbon by breathing it in from the atmosphere.B
A consumer is obtaining carbon by absorbing it from the soil.C
A consumer is obtaining carbon by eating carbon-based molecules stored in a producer.D
A consumer is obtaining carbon by eating carbon-based molecules stored in a decomposer.3
How is the nitrogen cycle important to humans?
A
It produces free nitrogen that can remove carbon dioxide from the atmosphere.B
It converts nitrogen into a form that humans can obtain by eating other organisms.C
It produces nitrogen compounds that humans can breathe.D
It converts nitrogen into a form that humans can obtain by absorbing it through their skin.4
Which human activity would most likely decrease the amount of carbon in the atmosphere?
A
clearing forestsB
heating coalC
burning woodD
planting trees5
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A
water vaporB
groundwaterC
runoffD
condensation6
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 decrease 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 increase the amount of carbon dioxide released by decomposers.7
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A
precipitationB
transpirationC
evaporationD
condensation8
Which best compares the roles of nitrogen-fixing bacteria and certain decomposers in the nitrogen cycle?
A
Both organisms convert free nitrogen into nitrogen-containing compounds.B
Both organisms convert nitrogen-containing compounds into free nitrogen.C
The bacteria convert free nitrogen into nitrogen-containing compounds, while the decomposers convert nitrogen-containing compounds into free nitrogen.D
The bacteria convert nitrogen-containing compounds into free nitrogen, while the decomposers convert free nitrogen into nitrogen-containing compounds.9
Which processes result in the release of carbon? Select three options.
A
Animals break down food molecules to obtain energy.B
The remains of producers are broken down by decomposers.C
The remains of consumers are broken down by soil decomposers.D
Producers take in carbon dioxide.E
Producers make sugars and starches.10
Chen drew a diagram to compare the ways in which different organisms obtain nitrogen.
A
take in from atmosphereB
produce themselvesC
eat other organismsD
absorb from soilDid you find these answers helpful?
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