Matter Cycles and Energy Flow in Ecosystems

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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When animals break down glucose to create energy, they release water and carbon dioxide (CO2.) How can carbon dioxide (CO2) be reused within the food web?

• It can be used by animals as a source of oxygen.

• It can be used by both plants and animals to produce energy.

• It can be used by plants during photosynthesis to create glucose.

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What happens to carbon dioxide levels in the atmosphere when we burn fossil fuels?

• carbon dioxide levels in the atmosphere rise

• carbon dioxide levels in the atmosphere fall

• carbon dioxide levels in the atmosphere stay the same

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How is the sun a part of a food chain?

• it is eaten

• it is the energy source

• it feeds animals

• it tastes good

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What is our role in the carbon cycle? 

• We are made of carbon. 

• We release it into the atmosphere when we breathe. 

• We release it into the atmosphere when using fossil fuels. 

• All of the above. 

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Which group in a food web is most likely to change atmospheric nitrogen into forms that are usable?

• consumers

• decomposers

• producers

• scavengers

What is the energy source for the carbon dioxide cycle?

• plants

• the Sun

• respiration

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Which best explains the role of bacteria in an ecosystem?

• They break down organic matter into necessary nutrient components.

•  They release energy from the decomposition of atmospheric gases.

• They convert carbon dioxide and water into simple carbohydrates.

• They absorb energy from the synthesis of inorganic compounds.

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Which best describes the role plants serve in the oxygen cycle?

• They absorb oxygen during photosynthesis.

• They absorb oxygen during decomposition reactions.

• They release oxygen as a waste product of photosynthesis.

• They release oxygen as a waste product in cellular respiration.

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Most producers get energy from the Sun using the process of

• cellular respiration

• chemosynthesis

• photosynthesis

• consumption

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