Cycles of Matter

Question 1

Which human activity would most likely decrease the amount of carbon in the atmosphere?

Revolt · Accepted Answer

planting trees

Question 2

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen.

Revolt · Accepted Answer

absorb from soil

Question 3

precipitationtranspirationevaporationcondensation

Revolt · Accepted Answer

condensation

Question 4

Which processes result in the release of carbon? Select three options.Animals break down food molecules to obtain energy.The remains of producers are broken down by decomposers.The remains of consumers are broken down by soil decomposers.Producers take in carbon dioxide.Producers make sugars and starches.

Revolt · Accepted Answer

Animals break down food molecules to obtain energy.; The remains of producers are broken down by decomposers.; The remains of consumers are broken down by soil decomposers.

Question 5

Which best describes a role of animals in the water cycle?

Revolt · Accepted Answer

They release water vapor when they exhale.

Question 6

Scott made a model of the water cycle by filling a tub with water, covering the tub with clear plastic, and placing a heat lamp over the tub. After a few days, he observed water droplets collecting on the plastic wrap.What process formed the water droplets in Scott’s model?

Revolt · Accepted Answer

condensation

Question 7

How is the nitrogen cycle important to humans?

Revolt · Accepted Answer

It converts nitrogen into a form that humans can obtain by eating other organisms.

Question 8

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

Revolt · Accepted Answer

It will increase the amount of carbon in the soil and increase the amount of carbon dioxide released by decomposers.

Question 9

Which best compares the roles of nitrogen-fixing bacteria and certain decomposers in the nitrogen cycle?

Revolt · Accepted Answer

The bacteria convert free nitrogen into nitrogen-containing compounds, while the decomposers convert nitrogen-containing compounds into free nitrogen.

Question 10

Some bacteria live in the roots of plants like soybeans and peas.

Revolt · Accepted Answer

to convert free nitrogen into usable nitrogen

Cycles of Matter Answers

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