Environmental Change

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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Scientists are concerned about overfishing of shark populations. Sharks feed on rays and rays feed on scallops. Without sharks, rays consume all the scallop beds. This situation demonstrates that:

• humans can improve an ecosystem by removing predators.

• humans can upset an ecosystem by removing species.

• reducing the shark population increases the quantity of scallops that can be taken.

• sharks are not important for the stability of the ecosystem.

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A park is home to a large number of robins, squirrels and rabbits. The robins and squirrels live in the park’s trees. The robins feed on earthworms and insects that live on the ground. The squirrels eat the acorns produced by the park’s oak trees. The rabbits hide in the bushes and feed on the grass. Which factor would negatively impact the number of rabbits living in the park?

• Collecting acorns off the ground.

• Planting more trees.

• Removing park bushes.

• Removing the squirrels.

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

• constructing highways

• planting trees

• recycling paper

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How does a bird "change its environment" to meet its NEEDS?

• builds a nest

• flies around

• catches bugs

• looks for something to eat

6. A squirrel makes a change to its environment when it —

• climbs a tree

• digs a hole to bury an acorn

• collects acorns

• jumps from tree to tree

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What do scientist call organisms that are not native to an ecosystem and cause harm to native organisms?

• native plants

• invaders

• invasive species

• natural species

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When a certain population becomes so dense that it harms or changes the quality of life in that environment, we have...

• population

• overpopulation

• pollution

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Which is NOT an example of a natural environmental change?

• a beaver dam

• a hurricane

• a volcanic eruption

• a housing development

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There are many large-mouth bass, a type of fish, living in a small lake near Waco, Texas. How would increased fishing in the lake effect the lake ecosystem?

• Predators of the bass might starve due to loss of a food source

• The population of the bass’ prey would decrease.

• The bass would spend more time swimming near the surface

• Water level in the lake would decrease as more fishing took place

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