Changes to Ecosystems

In a pond ecosystem, what would happen to frogs if the insect population decreased?

• There would be more frogs in the pond

• There would be more insects in the pond

• There would be less frogs in the pond

• More fish would move to the pond

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What would most likely happen if an ecosystem no longer received sunlight?

• The number of herbivores would increase

• The number of plants would increase

• all organisms would adapt

• All living organisms would eventually die

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Which would cause an ecosystem to change quickly ?

• an earthquake

• a lake drying up

• a climate change

• a lake becoming a marsh

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Why would algae grow in a lake?

• Because the lake is polluted

• The lake is a newly created ecosystem

• Because there are a lot of fish in the lake

• A natural disaster destroyed the lake

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Which of the following would have a negative impact on an ecosystem ???

• Constructing highways

• Planting trees

• Recycling paper

• Children playing with butterflies

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Raccoons eat aquatic animals. If chemicals entered the lake with rain water and destroyed the plants, how would this impact the raccoon population?

• Raccoons would have more aquatic animals to eat.

• Raccoons would begin eating land plants.

• Raccoons would have less aquatic animals to eat.

• Raccoons would only drink water.

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After this prairie was flooded, all the animals left and the grasses died. Which organism will most likely return first?

• jackrabbit

• hawk

• coyote

• grasses

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Which change would most likely cause all living things in an ecosystem to perish or move away?

• a flood on the plains

• fire in a forest

• a tornado on the plains

• a landslide down a mountain

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NGSS.MS-ESS3-2

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Which change would least likely cause plants in an ecosystem to perish?

• an earthquake on a grassland

• a hurricane along a beach

• a fire in a forest

• a flood in a valley

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NGSS.MS-LS2-4

What would happen to this food chain if there was no grass?

• The grasshoppers would eat the mice, and the snakes would move away.

• The mice would have more grasshoppers to eat.

• The snake population would increase.

• The grasshopper population would decrease.

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