Energy Flow within Ecosystems

Which of the following correctly describes the movement of energy and nutrients in an ecosystem?

• Energy flows in a continuous cycle, and nutrients flow in one direction.

• Both energy and nutrients cycle continuously within the biosphere.

• Energy flows in one direction, while nutrients are recycled within the ecosystem.

• Both energy and nutrients are used up completely and must be replaced.

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Only (a)   of energy is given to the next trophic level.   (b)   is eliminated as waste heat.

• 10%, 90%
• 90%, 10%
• 25%, 75%
• 75%, 25%

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For the ocean food chain which organism represents the trophic level containing about 1% of the initial amount of light energy acquired by the phytoplankton?

• a

• b

• c

• d

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A partial food web is shown in the diagram below

Species 'X' is most likely a -

• Decomposer

• Apex Predator

• Producer

• Consumer

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Why are pyramids the shape that is used to depict the relative amounts of biomass at each trophic level?

• All of the food is converted into heat at each trophic level

• Energy is distributed equally amongst all the trophic levels

• Each trophic level supports a smaller amount of biomass

• Organisms get larger in each successive trophic level

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Based on the image, which organism recieves the least amount of energy from the producer?

• Owl

• Grasshopper

• Lilypad

• Mouse

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In a food web, arrows point at (a)   . The arrow itself represents​ (b)   .

• who gets energy
• who gets eaten
• the flow of energy between organisms
• the matter going to the next organism

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An energy pyramid is shown. 

Which sentence best describes how energy flows through this pyramid?

• Energy is transferred down each level on the energy pyramid.

• The energy lost at each level is consumed by organisms in the top level. 

• Energy is transferred from organisms in one level to those in the level above. 

• The organisms at the bottom level provide energy directly to organisms in all the other levels. 

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Based on the model, which consumers would receive the greatest amount of energy captured by the producers in their food chains?

• Wedge-tailed eagles

• Chuditch

• Ring-tailed opossums

• Eucalyptus trees

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Choose the correct answer.

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