Trophic Cascades

Which is the keystone species for the jungle ecosystem?

• 
• 
• 
• 

According to the graph, what is causing the deer population to decrease

• They got sick

• The wolf population is decreasing

• The wolf population increased

• They ran out of food

Examine the graph below of two animal populations. Which animal must be the prey species?

• A

• B

Predator population lags behind prey population because......

• Increase in predators leads to decrease in prey

• Increase in predators leads to increase in prey

• Increase in predators leads to decrease in producers

• Increase in producers leads to increase in prey

in 1995 Wolves were reintroduced to Yellowstone National Park. Which answer below most accurately describes a possible trophic cascade the could result from the reintroduction of wolves?

• wolves reintroduced-> deer population increased -> tree and vegetation cover decreased

• wolves reintroduced-> beaver population decreased -> tree and vegetation cover increased

• wolves reintroduced-> deer population decreased -> tree and vegetation cover increased -> beaver population increased

• wolves reintroduced-> deer population decreased -> beaver population decreased -> songbird population increased

Which animal is the apex predator?

• hawk
• lizard
• snake
• grass

Which animal is not the apex predator but, a predator to a mouse?

• hawk
• rabbit
• snake
• grass

In an energy pyramid, how much of the energy in each level gets passed to the next level above it?

• 80%

• 90%

• 10%

• 20%

Which of the following is a herbivore?

• cricket
• frog
• hawk
• shrew

An organism that obtains energy by eating other organisms.

• Consumer

• Producer

• Decomposer

• Detritivore