AnswersMO-Earth and Space Science ACycles of Matter

Cycles of Matter Answers

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

A
decomposition
B
condensation
C
fixation
D
transpiration
2
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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?

A
evaporation
B
transpiration
C
condensation
D
precipitation
3

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

A
They help water vapor condense when they produce waste.
B
They help water vapor condense when they inhale.
C
They release water vapor through transpiration.
D
They release water vapor when they exhale.
4

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.
5

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.
6

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

A
clearing forests
B
heating coal
C
burning wood
D
planting trees
7

[BLANK]

A
precipitation
B
transpiration
C
evaporation
D
condensation
8

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

Question illustration
A
to absorb nitrogen-containing compounds from the soil
B
to release free nitrogen into the atmosphere
C
to break down nitrogen-containing compounds in dead organisms
D
to convert free nitrogen into usable nitrogen
9

The diagram illustrates part of the carbon cycle.

Question illustration
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.
10

Kate wrote the steps of the carbon cycle to describe how carbon is cycled through specific organisms. The steps are in random order.1 - The rabbit decomposes.2 - The rabbit eats the carrot plant. 3 - The carrot plant takes in carbon dioxide from the air during photosynthesis.4 - Carbon compounds are returned to the soil.

A
2, 3, 1, 4
B
3, 2, 1, 4
C
3, 4, 2, 1
D
2, 4, 3, 1

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