Ecosystems EOG

Which best represents the flow of energy within an aquatic ecosystem?

• algae → insects → fish → turtle → sunlight

• insects → algae → fish → turtle → sunligh

• sunlight → insects → algae → fish → turtle

• sunlight → algae → insects → fish → turtle

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The diagram shows a food web in an ecosystem. The removal of which organism would result in the MOST damage to the ecosystem?

• rabbits

• decomposer

• consumer

• producer

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How much energy moves from one trophic level to the next in an ecosystem?

• 50%

• 10%

• 100%

• 75%

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What would happen to the rabbit population if the fox population moved out of the area represented by the food web?

• stay the same

• The rabbit population would decrease

• The rabbit population would neither increase nor decrease

• The rabbit population would increase

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Which of these organisms is a producer in a marine ecosystem?

• fish

• gull

• algae

• worm

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Which best determines the number of wolves that can live in an area?

• the amount of snow in the area each year

• the number of birds hat live in the area

• the number of trees in the area

• the amount of food available in the area

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If wolves prey on deer for food, what will most likely happen to the deer population if wolves are removed from an area where deer live?

• The population of deer will increase.

• The population of deer will decrease

• The population of deer will remain the same

• The population of deer will become extinct

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Where do plants get most of the energy they need to live and grow?

• water

• soil

• air

• sunlight

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In a food pyramid, which best explains why the number of organisms decreases from one trophic level to the next?

• Consumers at the lower level require more energy than the top-level consumers.

• Consumers at the top level require more energy than the lower-level consumers.

• The consumers are feeding on larger organisms that have less energy.

• The consumers are feeding on smaller organisms that have less energy.

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The table shows the food choices for two species of birds.

Which will most likely happen to Questors as a result of Wood Plaxers migrating to their habitat?

• The Questors will compete with the Wood Plaxers for food resources.

• The Questors will be forced to fly to a different habitat.

• The two species will become extinct.

• The two species will coexist with no competition.

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