Unit 9 Test REVIEW - 8.12ABC Ecosystems 8th Grade

Which of these could disrupt the balance of a food web?

• A) A steady increase in rainfall

• B) Excessive removal of a fish species

• C) Planting more trees in a forest

• D) A balanced number of predators and prey

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What might happen if a natural event alters a coastal food web?

• All organisms thrive immediately

• Some populations decline temporarily

• The ecosystem remains unchanged

• Predators increase in number

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In a food web diagram, what do the arrows indicate?

• The size of each population

• The movement of energy between organisms

• The location of species in an area

• The age of the ecosystem

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Which event could be considered a natural disruption in a forest?

• Building a new road

• A storm knocking down trees

• Adding more deer to the area

• Farmers grazing livestock

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If water pollution occurs, which group might feel the effects first?

• Animals that eat plants

• Organisms that break down waste

• Plants that grow in the water

• Predators at the top of the web

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What is the main job of decomposers in an ecosystem?

• To produce energy from sunlight

• To recycle dead matter

• To hunt smaller animals

• To eat only plants

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Where does the energy in a food web primarily come from?

• The soil nutrients

• The sunlight

• The herbivores

• The carnivores

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What could happen if too many plant-eating animals live in one area?

• More plants grow quickly

• The soil gets richer

• Plants get eaten faster than they regrow

• Predators leave the area

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If a natural event reduces plant life, what might happen next in the food web?

• Herbivores increase in number

• Carnivores have more food

• Plant-eaters struggle to survive

• The ecosystem grows stronger

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If humans reduce the number of snakes in an ecosystem, what might change?

• Plants don't grow well

• More rodents thrive

• The ecosystem has no change

• Plants grow more abundantly

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