Energy Flow within Ecosystems

If the bird population DECREASED, which populations would INCREASE as a result?

• bees and deer

• bees and grasshoppers

• snakes and hawks

• grasshoppers and rabbits

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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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The diagram below shows a desert food web.

How will a large decrease in the number of rats impact the food web shown above?

• There will be an increase in the number of ants, tarantulas, and snakes.

• There will be an increase in the number of snakes, coyotes, and hawks.

• There will be a decrease in the number of snakes, coyotes, and hawks.

• There will be a decrease in the number of cacti and sagebrush plants.

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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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How are primary consumers different from secondary consumers?

• Primary consumers eat only plants; secondary consumers eat other consumers.

• Primary consumers eat other consumers; secondary consumers eat only plants.

• Primary consumers eat plants and other consumers; secondary consumers eat plants and decompose matter.

• Primary consumers eat plants and decompose matter; secondary consumers eat plants and other consumers.

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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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