Cycles of Matter in an Ecosystem

Which of the following explains the long term portion of the phosphorus cycle?

• Phosphorus is stored in rocks, and it is slowly recycled back into the ecosystem through weathering and erosion.

• Phosphorus is constantly cycled through the food chain starting at the producer level and working its way to the apex predator.

• Phosphorus does not have a long term portion.

• Phosphorus cannot be recycled and reused because it is a nonrenewable resource.

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The continuous process by which water moves from Earth's surface to the atmosphere and back

• Nitrogen Cycle

• Carbon Oxygen Cycle

• WaterCycle

• Nitrogen Fixation

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Organism that breaks down dead plants & animals and releases nitrogen back into atmosphere

• bacteria

• plants

• animals

• producers

What is the process that converts nitrogen into a form that can be used by plants and animals?

• Combustion

• Photosynthesis

• Decomposition

• Nitrogen Fixation

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NGSS.MS-LS2-3

Which of the following best explains why nitrogen fixation must take place?

• Atmospheric nitrogen is unusable to plants and animals

• Nitrogen must be returned to the atmosphere

• Animals must breathe in nitrogen

• Nitrogen gets "stuck" in the soil and must be untrapped

How is matter recycled in ecosystems?

• Matter can take on different forms as it goes through different processes.

• Matter moves through ecosystems through biogeochemical cycles.

• Matter is recycled as organisms in different trophic levels consume and finally when decomposers return matter to the ecosystem.

• All of these are true.

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What does conservation of matter mean?

• Matter cycles through an ecosystem and 10% is lost as you move through each trophic level.

• Matter cannot be created, but can be destroyed.

• Matter cannot be created nor destroyed, and cycles through ecosystems.

• Matter and energy both move through ecosystems with 100% efficiency.

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All living parts of an ecosystem (plants, animals, and decomposers) are depend on one another for

• food

• energy

• cycling matter

• food, energy, and the cycling of matter

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Photosysnthesis and respiration are important because

• they make mutualism possible

• they are the building blocks of life

• they are the 6 characteristics of life

• they cycle matter and energy between autotrophs and heterotrophs

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which of the following processes is primarily responsible for the movement of carbon from the atmosphere into living organisms?

• Photosynthesis

• Respiration

• Decomposition

• Evaporation

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