Matter and Cycles in Ecosystems

Which is true of matter in an ecosystem?

• matter flows

• matter is destroyed

• matter cycles

• matter is created

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NGSS.MS-LS1-6

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In which process do producers use light energy and make their own food?

• chemosynthesis

• fermentation

• glycolysis

• photosynthesis

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What organisms help break down dead leaves in an ecosystem?

• carnivores

• detritivores

• herbivores

• omnivores

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Which process converts atmospheric nitrogen to a form organisms can use?

• absorption

• fixation

• retention

• stabilization

What is the continuous movement of matter through the living and nonliving parts of an ecosystem called?

• Matter Cycle

• Nitrogen Cycle

• Geological Cycle

• Marvel Expanded Cycle

• Water Cycle

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How does matter move among the living and nonliving parts of an ecosystem?

• matter is recycled within and between ecosystems

• one-way flow of energy

• two-way flow of energy only

• three-way flow of energy only

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NGSS.MS-LS2-3

The matter in an ecosystem is constantly being used and reused by living organisms. Three of these statements describe matter flowing through an ecosystem. Which statement does not describe the flow of matter through an ecosystem?

• Humans release carbon dioxide when they breathe that plants then absorb from the air.

• Rainfall washes dirt to the bottom of a hillside.

• Decomposers break down dead animals into nutrients that plants can later use.

• Consumers eat smaller animals and then leave droppings on the ground.

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Plants and animals need nitrogen to make __________.

• Protein

• Carbohydrates

• Lipids

• Nucleic Acids

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What are the 4 cycles that occur naturally in an ecosystem?

• Water Cycle, Nitrogen Cycle, Bicycle, Oxygen Cycle

• Spin Cycle, Wash Cycle, Rinse Cycle

• Water Cycle, Nitrogen Cycle, Oxygen Cycle, Carbon Dioxide Cycle

• Water Cycle, Nitrogen Cycle, Oxygen Cycle, Carbon Monoxide Cycle

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How do humans obtain the nitrogen they use in their bodies?

• by absorbing nitrogen found in the soil

• by breathing the nitrogen present in the atmosphere

• by absorbing ammonia from bacteria growing in the roots of plants

• by consuming plants or other animals