Interdependent Relationships in Ecosystems

If two organisms have a relationship in which one benefits and the other is harmed (+,-), it is an example of

• mutualism

• commensalism

• parasitism

What would happen to the population of fish if they did not receive sunlight?

• increase

• decrease

• stay the same

• none of these

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Producers use _______________.

• water to produce food from carbon dioxide in the air and water

• light energy from the Sun to produce food from carbon dioxide in the air and water

• decomposers to produce food from carbon dioxide in the air and water

• nutrients from the soil to produce food

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In this food chain, which organism is the primary consumer?

• Hawk

• sun

• mouse

• grass

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Which organism will destroy the food web if it is removed?

• green plants

• fox

• rabbit

• owl

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There was a fire in a forest destroying over haof of the ecosystem. What would happen to the plants and animals of the ecosystem?

• Only animals will be destroyed.

• Only plants will be destroyed.

• Plants and animals will be destroyed.

• This ecosystem will remain the same.

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In which ecosystem would you expect to find the following biotic factors: fish, amphibians, ducks, turtle, beavers, lily pads, and duckweed?

• forest

• grassland

• lakes/ponds

• ocean

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What type of symbiotic relationship benefits both organisms involved?

• Mutualism

• Commensalism

• Parasitism

• Predation

Which of the following is an example of a keystone species in an ecosystem?

• Sea otter

• Grasshopper

• Earthworm

• Pigeon

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In a food web, what role do decomposers play?

• Producers

• Consumers

• Recyclers

• Predators

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