Cycling of Matter in Ecosystems

According to the principles of biogeochemical cycles, which statement is true about matter?

• Matter can be created in laboratories.

• Matter can be destroyed by natural processes.

• Matter cannot be created or destroyed.

• Matter is only recycled in the abiotic environment.

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NGSS.MS-LS2-3

What role do denitrifying bacteria play in the nitrogen cycle?

• They convert atmospheric nitrogen into usable forms for plants.

• They release nitrogen gas back into the atmosphere by breaking down dead matter and waste.

• They fix nitrogen from the atmosphere into the soil.

• They consume nitrogen from the soil and use it for plant growth.

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NGSS.MS-LS2-3

How is nitrogen transferred from the soil to consumers in the food web?

• Through water absorption by consumers.

• By consumers directly inhaling nitrogen gas.

• Through consumption of producers that have absorbed nitrogen.

• By microbial action in the stomachs of consumers.

Tags

NGSS.MS-LS2-3

What happens during the process of denitrification in the nitrogen cycle?

• Ammonium is converted into nitrites.

• Nitrogen compounds are reduced to gaseous nitrogen.

• Atmospheric nitrogen is fixed into the soil.

• Nitrogen is incorporated into organic matter.

Tags

NGSS.MS-LS2-3

What happens when rocks containing phosphorus are broken down?

• Phosphorus is absorbed by animals directly

• Phosphorus evaporates into the atmosphere

• Phosphorus is released as phosphates into the soil

• Phosphorus forms new rocks

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How is phosphorus transferred from plants to animals in the phosphorus cycle?

• Through water absorption

• By animals eating the plants

• Through photosynthesis

• By air transfer

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NGSS.MS-LS2-3

What happens to phosphorus when animals and plants die?

• It evaporates into the atmosphere.

• It is used immediately by other living organisms.

• Decomposers release it back into the soil, continuing the cycle.

• It becomes inert and non-reactive.

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How are water and nutrients typically obtained in the environment?

• They are imported from other ecosystems.

• They are produced or obtained from chemicals already present in the environment.

• They spontaneously generate under certain conditions.

• They are created through artificial means.

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NGSS.MS-ESS2-4

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What is the role of biogeochemical cycles in the environment?

• To increase the chemical compounds in the environment.

• To facilitate the movement of matter through the biotic and abiotic environment.

• To reduce the amount of nutrients in ecosystems.

• To create new forms of matter.

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NGSS.MS-ESS2-4

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Which process in the water cycle is responsible for water vapor moving back to Earth?

• Condensation

• Evaporation

• Precipitation

• Transpiration

Tags

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