Natural and Human Changes to Ecosystems

How will a beaver's dam most likely affect the ecosystem?

• It will form a pond of still water.

• It will stop floods from happening.

• It will make more trees.

• It will make the stream run more quickly.

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It is cold and snowy in many parts of Pennsylvania in the winter. How would the cold and snow most likely affect animals that eat mainly grass?

• It will have less food.

• It will have more food.

• It will have less water.

• It will not be able to find shelter.

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If gasoline is accidentally poured on the ground, and it gets into the water, what will most likely happen?

• The water will flow more quickly.

• Trees will grow taller.

• Fish and animals could get sick from the water.

• The animals will use the gas to drive cars.

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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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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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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 organisms are least likely to perish if this grassland is flooded?

• butterfly and jackrabbit

• hawk and butterfly

• coyote and jackrabbit

• coyote and hawk

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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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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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