An organism that breaks down dead plants and animals, returning matter back into the soil, is called a

• herbivore

• producer

• competitor

• decomposer

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A brown bear eats a variety of foods including berries, insects, and small animals. Which BEST describes a brown bear?

• producer

• herbivore

• carnivore

• omnivore

Which best explains why producers are at the beginning of all food chains?

• They turn dead animals into nutrients.

• They provide shelter for smaller animals.

• They transfer energy from the sun into food.

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When is an ecosystem able to best support a variety of organisms?

• when only one type of shelter is available

• when organisms share food and habitats equally

• when organisms use the parts of the ecosystem differently

• when there is a high level of competition for food among organisms

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In the food web below, which is an example of a consumer?

• tree

• grass

• rabbit

A crow eats the remains of a dead animal. What type of consumer does this prove the crow to be?

• a decomposer

• a herbivore

• a predator

• a scavenger

The diagram above shows part of a lake food web.

Many tourists and locals have been fishing in the same spot in this lake for a long period of time. How will the organisms in this food web MOST likely be affected if this fishing continues?

• The frog population will have fewer dragonflies to eat.

• The dragonfly population will have more beetles to eat.

• The pelican population will have less herring to eat.

• The mayfly population will have less algae to eat.

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What would happen if the snakes were taken out of this food chain?



• Clover would decrease.

• Frogs would increase.

• Grasshoppers would increase.

• Owls would increase.

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The diagram above shows part of a river food web.

A disease reduces the number of young salmon in a river. Which populations will MOST likely increase as a result?

• trout and eagle

• algae and trout

• otter and sculpin

• sculpin and algae

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Which best explains why many kinds of plants and animals can live together in an ecosystem?

• The plants and animals all care for each other and protect one another.

• The plants and animals are all part of a food chain and depend on each other to live.

• The plants and animals are independent of one another, so they can live together.

• The plants and animals all feed on the same things, so they compete with each other for food.

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