Nutrient Cycling

The cycling of matter is important because

• Matter can be created and destroyed

• Only a limited amount of matter is available so it has to be recycled

• Matter can only be found in a solution

• Bacteria use matter to convert organisms into solar energy

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Angie constructs models of the carbon cycle, nitrogen cycle, and water cycle. What type of ecological models are these?

• food web

• food chain

• biogeochemical cycles

• geological system

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Matter cycles through food webs and biogeochemical cycles.

• True

• False

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Matter can recycle through the biosphere because

• matter is passed out of the body as waste

• matter is assembled into chemical compounds

• biological systems do not use up matter, they transform it.

• biological systems use only carbon, oxygen, hydrogen, and nitrogen.

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NGSS.MS-LS2-3

Bob grows vegetables in the same soil year after year. The plants produce less and less vegetables each year. Which of these processes could help explain Bob's observation?

• the rate at which soil bacteria perform photosynthesis

• the rate at which soil bacteria perform denitrification

• the rate at which soil bacteria perform cellular respiration

• the rate at which soil bacteria perform nitrogen fixation

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What changes nitrates back to nitrogen gas in the atmosphere?

• photosynthesis

• cheosynthesis

• nitrification

• denitrification

What is the process by which bacteria convert nitrogen gas in the air to ammonia?

• nitrogen fixation

• decomposition

• excretion

• denitrification

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What is the primary role of decomposers in nutrient cycling?

• A) To produce energy through photosynthesis

• B) To break down dead organisms and recycle nutrients

• C) To fix nitrogen from the atmosphere

• D) To provide food for primary consumers

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Which of the following processes is directly involved in the nitrogen cycle?

• A) Photosynthesis

• B) Nitrogen fixation

• C) Evaporation

• D) Sedimentation

In the context of nutrient cycling, what is leaching?

• A) The absorption of nutrients by plant roots

• B) The loss of water-soluble nutrients from the soil

• C) The conversion of nitrogen gas to ammonia

• D) The decomposition of organic matter

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