Unit 3 Matter and Energy in Ecosystems Review

Which one of these does not add CO2 to the atmosphere?

• cooking with gas
• planting trees
• burning wood
• riding in a bus

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NGSS.MS-LS2-3

NGSS.MS-LS1-6

How do living organisms return carbon to the atmosphere in the carbon cycle?

• respiration and photosynthesis
•  decomposition and respiration

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NGSS.HS-LS1-7

NGSS.HS-LS2-5

In the carbon cycle, producers take in the gas __

• carbon dioxide
• oxygen
• nitrogen
• carbon monoxide

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NGSS.MS-LS2-3

NGSS.MS-LS1-6

How does the carbon in grass become part of a lion?

• The lion eats the grass
• Carbon from grass doesn't end up in a lion. 
• The carbon ends up in the lion's food chain. 
• The lion breathes in carbon given out by the plant

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NGSS.MS-LS2-3

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The flow of carbon from the biosphere to the atmosphere would be slowed by reducing the

• amount of fertilizer applied to fields.
• number of size of forest fires
• buildup of carbonate rocks
• amount of rain water used for irrigation

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NGSS.MS-LS2-3

NGSS.MS-LS1-6

Which of the following describes the role of nitrogen-fixing bacteria in the nitrogen cycle? Nitrogen-fixing bacteria convert

• nitrates intro nitrogen gas
• ammonia into proteins
• nitrogen gas into ammonia
• proteins into nitrates

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NGSS.MS-LS2-3

Animals obtain the nitrogen they need directly from the

• soil in their habitat
• air they breathe
• plants they eat
• bacteria living within them

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NGSS.5-LS2-1

Nitrogen fixation processes nitrogen from which of the following sources?

• lightning
• fertilizers
• dead plants
• atmosphere

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NGSS.MS-LS2-3

A particular golf course is using large amounts of nitrogen fertilizer. What process could move this nitrogen into a local stream?

• volatilization
• nitrogen fixation
• runoff
• ammonification

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NGSS.MS-LS2-3

NGSS.MS-ESS3-3

Scientists have detected a dramatic decrease in usable nitrogen levels in the soil of a local ecosystem. Which of the following is a likely theory to explain this problem?

• A decrease in the amount of lightning strikes.
• An increase in fertilizer usage at local farms.
• An increase in the biomass forming plants.
• A decrease in bacterial colonies within the soil.

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NGSS.MS-LS2-3

NGSS.MS-LS2-1

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