Yellowstone National Park Ecosystem Quiz

What is a trophic cascade?

• An ecological process that starts at the bottom of the food chain

• An ecological process that starts at the top of the food chain

• An ecological process that starts in the middle of the food chain

• An ecological process that starts with plants

What happened in Yellowstone National Park when wolves were reintroduced in 1995?

• The ecosystem remained unchanged

• The number of deer decreased

• The number of deer increased

• The vegetation started to disappear

What was the major effect of the wolves' arrival in Yellowstone National Park?

• Killing some of the deer

• Changing the behavior of the deer

• Attracting more birds

• Increasing the number of beavers

What happened to the height of the trees in some areas of the park after the wolves arrived?

• Doubled

• Decreased

• Quintupled

• Remained the same

What started to increase greatly after the wolves arrived in Yellowstone National Park?

• The number of deer

• The number of beavers

• The number of coyotes

• The number of rabbits

What did the beavers and wolves have in common in the ecosystem?

• They both avoided certain areas of the park

• They both migrated to the park at the same time

• They both ate the same food

• They both created habitats for other species

What did the wolves kill, resulting in the rise of rabbits and mice?

• Hawks

• Beavers

• Deer

• Coyotes

What came down to feed on the carrion left by the wolves?

• Bears and eagles

• Ravens and bears

• Ravens and eagles

• Eagles and hawks

What did the bears reinforce the impact of the wolves by doing?

• Feeding on the carrion left by the wolves

• Killing some of the deer calves

• Eating the berries on the regenerating shrubs

• Building dams in the rivers

What did the wolves change the behavior of in the rivers?

• Meandering

• Pooling

• Erosion

• Narrowing