Populations and Resources Chapter 3

What is a molecule that organisms can use to release the energy they need to survive?

• an energy storage molecule
• a water storage molecule
• an internal storage molecule

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A model that shows what eats what in an ecosystem is a _______________.

• Food Energy Model
• Food Storage Chart
• Food Web

What is an indirect effect?

• the result of one cause stopping a desired effect
• when there is a direct relationship between one organism and the next
• the result of one cause leading to an effect that causes one or more other effects

What is it called when two or more populations use the same resource?

• Consumer
• Indirect effect
• Competition

True or False? Consumer populations eat Resource populations to get the energy they need to reproduce.

• True
• False

If the consumer population decreases, then the resource population will __________.

• Increase
• Decrease
• Stay Stable

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Opossums and foxes eat rats. Which organisms are in competition?

• Opossums and rats
• Foxes and opossums
• Rats and foxes

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In the northwestern United States, both coyotes and wolves eat deer. The sizes of the populations have been stable for the last 6 years, but recently the size of the wolf population increased. What will likely happen to the coyote population? The size of the coyote population will . . .

• The coyote population will increase
• The coyote population will decrease
• The coyote population will stay stable

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In a rainforest, both spiders and frogs eat flies. The sizes of the populations have been stable for the last 10 years, but recently the size of the frog population decreased. What will likely happen to the spider population?

• The spider population will increase
• The spider population will decrease
• The spider population will stay stable

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How would a decrease in the eagle population affect the bear population?

• The bear population would decrease
• The bear population would increase
• The bear population would remain stable

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