Ecosystem Changes

In what ways can humans change an ecosystem?

• By making a region flood

• By creating hurricanes

• By adding to the amount of pollution in an ecosystem

• By enjoying nature

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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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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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The picture shows a type of plant called kudzu. Kudzu is a fast-growing Asian vine that was introduced into the United States. Kudzu quickly uses available resources and can completely cover the plants in an area. What effect does the rapid growth of kudzu most likely have on an ecosystem?

• The variety of native plants decreases

• The water supply in the area increases

• Weather patterns in the area change

• The number of other plants increases

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According to the chart, what would most likely happen in an ecosystem if there were a sudden decrease in the number of bacteria and fungi?

• The number of plants would increase

• The number of bees would increase

• The amount of nutrients in the soil would decrease

• The amount of water in the air would decrease

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If disease removed a species of plant from a food web, how would that ecosystem MOST LIKELY be affected?

• All of the plants in the ecosystem would become extinct

• The organisms that eat the plant would become extinct

• Consumers of the plant would have a smaller food source

• Producers in the ecosystem would have a smaller energy supply

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Clearing a forest to build a shopping mall will most likely result in woodpeckers —

• nesting on roofs

• losing habitat

• laying more eggs

• flying slower

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The picture shows a frog in a pond containing duckweed. Which of these human activities would most likely cause an overgrowth of duckweed in a pond environment?

• Gradually introducing geese into the pond

• Fishing in the pond as recreation

• Planting trees in nearby forests

• Heavily fertilizing nearby farm fields

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NGSS.MS-ESS3-4

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When trees develop leaves in the spring, changes occur on the forest floor. Why does the development of leaves cause changes on the forest floor?

• Rainfall increases

• Sunlight is reduced

• Wind speed increases

• Animal migration is stopped

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