Energy Transfer in Ecosystems

An arctic food web is shown. Suppose that the lemming population is removed from the web. Which of the following would be a likely short-term effect of this change?

• The arctic fox population will increase.

• The polar bear population will increase.

• The caribou population will decrease.

• The snowy owl population will decrease.

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A team of ecologists observed feeding patterns of several populations in the desert. Which of the following best explains the difference in the amount of available energy in the trophic levels of the desert ecosystem?

• There is less energy in the producers because they are at the bottom.

• There is more energy in the producers because they provide energy for all the consumers in the ecosystem.

• There is more energy available in the tertiary consumers because they need the energy to hunt.

• There is more energy in the level containing the top predators because they are larger in size.

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Read the following passage to answer the question that follows.

Ducks and snails often eat grass and algae in freshwater ponds. The snails are eaten by mice and ducks. Foxes prefer to eat mice but will eat a duck if the opportunity arises.

Which of the following food chains correctly represents the information in the passage?

• snails --> algae --> mice --> fox

• fox --> ducks --> mice --> algae

• grass --> snails --> mice --> fox

• fox --> duck

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In the food web provided, which organism is considered an omnivore?

• Grasshopper

• Frog

• Mouse

• Hawk

If the grass has 100% of energy how much does the secondary consumer get?

• 10%

• 1%

• 100%

• 0.1%

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What percent of energy moves on to each trophic level in a food chain?

• 1%

• 10%

• 100%

• .01%

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How many producers are in this image?

• 1

• 2

• 3

• 4

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Where does the red tail hawk directly get his energy from?

• Hare (rabbit)

• Red Fox

• Lynx

• White Spruce

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Fungi, bacteria and worms can all break down organic material, what is the correct name for these type of organisms.

• Producers

• Consumers

• Predators

• Decomposers

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An organism that must consume other organisms for nutrients.

• Consumer

• Producer

• Parasite

• Decomposer

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