Changes to an Ecosystem

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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NGSS.MS-ESS3-4

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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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NGSS.MS-LS2-1

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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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A highway is built through a forest. This will most likely have which of the following effects on the organisms in the area?

• Increase the number of bird species in the forest

• Raise the birth rate of the animals on the forest floor

• Eliminate all species of plants found in the forest

• Make it difficult for animals to move through the forest

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NGSS.MS-LS2-4

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A foreign insect is introduced into the Texas. It eats a lot of leaves, and trees start to become leafless. Many different animals feed on the new insect, but even they cannot control its numbers. Eventually, trees begin to die. Why would a rapid increase of the new insect population cause certain species of herbivores to vanish or be fewer in number?

• They would not have enough to eat. 

• They would not have enough space to live.

• They would not have tree bark to eat.

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NGSS.MS-LS2-1

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How would beavers building a dam cause an increase in the fish population? The dam

• blocks a river and creates a lake.

• causes predators to hunt more fish.

• forces many birds to leave the ecosystem.

• removes trees from around the river.

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If humans cleared a forest to build homes, we would expect _____________.

• fewer tree-dwelling animals

• increased insect populations

• more development of soil

• more frequent thunderstorms

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NGSS.MS-LS2-1

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Humans are part of the ecosystem and therefore impact it. Which of the following events in an ecosystem may produce a negative effect?

• Preventing deer from depleting food resources.

• Restoring a natural habitat.

• Wildlife rangers minimizing disturbances.

• A lumber company clearing a forest.

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NGSS.MS-ESS3-4

NGSS.MS-LS2-4

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Alligators are the large predators that eat many of the smaller animals in a swamp. How might removing the alligators from a swamp habitat create a decrease in vegetation?

• Meat-eating animals would begin eating plants.

• The plants in the swamp would get more sunlight.

• More plant-eating animals would survive.

• Plants would not be able to spread their seeds.

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If humans over-hunted a population of insect-eating birds, what immediate change would likely be seen in the area?

• Increased seedling germination

• Increased populations of insects

• Migration of small mammals

• Severe loss of vegetation

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NGSS.MS-LS2-4