Science Unit 3 Test

A (a)   makes its own food.

• consumer
• carnivore
• producer
• animal

Organize these options into the right categories

Groups:

(a) Producer

,

(b) Consumer

• Wolves

• Aspen Trees

• Beavers

• Elk

What was a problem created by removing the wolves?

• Populations of aspen trees were able to grow once the wolves were removed.

• Beaver populations grew too large because the wolves were no longer threats.

• The elk had no predators and populations grew out of control.

• Elk populations decreased due to the removal of the wolves.

What argument does the author make about the wolves in Yellowstone National Park?

• The removal of wolves caused the ecosystem to become unbalanced, showing their importance in controlling elk populations.

• The removal of wolves had no impact on the environment, proving they were unnecessary.

• The reintroduction of wolves caused the elk population to increase, harming the ecosystem.

• The author does not express an opinion about the impact of wolves on Yellowstone.

What is the best argument regarding the removal of the wolves from Yellowstone?

• The wolves should not have been removed because there were no predators to control the populations of elk.

• The wolves should not have been removed because that caused an explosive growth of aspen trees.

• The wolves should have been removed because that allowed populations of elks to grow explosively.

• The wolves should have been removed because the lack of food for beavers made the beavers move elsewhere.

Was reintroducing the wolves to Yellowstone a good solution?

• Yes, the reintroduction of wolves controlled the elk population so other species could thrive.

• Yes, by reintroducing wolves the elk population could grow and control numbers of other species.

• No, the wolves wiped out the elk population so populations of aspen grew out of control.

• No, the wolves were a predator for beavers, so wetlands were destroyed.

  No, the wolves were a predator for beavers, so wetlands were destroyed. - no response given

How can you tell that the passage about the wolves in Yellowstone is written as an opinion or argument rather than just facts?

• The passage includes statements that show the author believes wolves are important for the ecosystem.

• The passage only lists facts and does not express any viewpoint.

• The passage includes exact numbers and statistics, making it purely informational.

• The passage does not take a side and only describes what happened.

Wild pigs are a(n) (a)   that were introduced from Europe. They eat almost everything and (b)   native wildlife for food resources. The pigs also destroy (c)   , another food source, as they trample over the land. They have no natural (d)   , and females reproduce about ten times in their lifetimes.

• invasive species
• compete with
• vegetation
• predators

What distinguishes an invasive species from other species in an ecosystem?

• An invasive species is not native to the ecosystem and causes harm.

• An invasive species is from another country and grows well in a new area.

• An invasive species is an existing species that spreads quickly.

• An invasive species is an existing species that overtakes the resources in an ecosystem.

Some species, such as kudzu, can completely change an ecosystem.

Kudzu is a plant native to Asia. It was brought to the southeast United States where it grew very (a)   . In its new home, Kudzu (b)   resources such as food, water, and sunlight. It (c)   native species in the environment.

• quickly
• competes for
• crowds out