Yellowstone National Park Ecosystem Quiz

What is a trophic cascade?

• A type of river in the park

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

• A type of vegetation in the park

• A type of bird found in Yellowstone National Park

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

• The number of deer increased

• The number of birds decreased

• The number of bears decreased

• The number of deer decreased

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

• The number of wolves increased

• The number of deer increased

• The vegetation in the park decreased

• The deer started avoiding certain parts of the park

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

• It decreased

• It quintupled

• It remained the same

• It doubled

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

• The number of coyotes

• The number of beavers

• The number of wolves

• The number of deer

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

• They both ate the same type of vegetation

• They both avoided certain parts of the park

• They both created habitats for other species

• They both hunted the same type of animals

What did the wolves kill that led to the rise in the number of rabbits and mice?

• Birds

• Beavers

• Coyotes

• Deer

What did the wolves change in the behavior of the rivers in Yellowstone National Park?

• They made the rivers meander more

• They caused more erosion in the rivers

• They made the rivers meander less

• They made the channels wider

How did the reintroduction of wolves affect the elk population in Yellowstone National Park?

• The elk population became extinct

• The elk population remained the same

• The elk population increased due to lack of predators

• The elk population decreased, leading to more vegetation growth

What impact did the wolves have on the bear population in Yellowstone National Park?

• The bear population decreased as wolves outcompeted them

• The bear population increased due to more carrion from wolf kills

• The bear population remained stable

• The bear population decreased due to increased competition for food