Matter Cycles and Energy Flow in Ecosystems

Consumers have several energy levels. All the statements are false except

• As consumers advance to other levels, they get fewer in number.

• As consumers advance to higher levels, they become more numerous.

• As consumers advance, they restrict their diet to one organism.

• As consumers advance they make more energy.

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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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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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Where is the majority of nitrogen located?

• Most of the nitrogen on Earth is in the atmosphere.
• Most of the nitrogen on Earth is in the soil.
• Most of the nitrogen on Earth is in the water.
• None of the above.

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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By which process is water taken from the ocean to form clouds?

• condensation
• evaporation
• transpiration

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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

Which shows the correct flow of energy through this simple food chain?

• fox → grass → rabbit
• grass → fox → rabbit
• grass → rabbit → fox
• rabbit → grass → fox

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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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