UNIT4: Interactions in Ecosystems

Front

frogs are a predator, and grasshoppers are their prey. If the number of frogs increases, what happens to the number of grasshoppers?

Back

Population Decreases

Front

Both frogs and birds eat grasshoppers. What kind of relationship do the frogs and birds have?

Back

Competitive

Front

Which statement best describes ALL invasive species?

Back

are non-native and always cause economic or ecological damage.

Front

If the amount of grass decreases, what will happen to the population of frogs?

Back

Population Decrease

Front

Mountain lions are predators to rabbits. Rabbits are predators to prey. What could cause the number of rabbits to change?

Back

Both the number of mountain lions and the availability of plants can cause a change in the population of rabbits.

Front

In an ecosystem, wolves eat deer and rabbits. If bears are introduced to the ecosystem, and the number of deer and rabbits eaten by wolves stays the same, what will happen to the population of plants?

Back

The amount of plants will increase

Front

What pattern in the weasel population begins during each of the years that followed 1988, 1992, 1996, and 2000? Options: Increase, Decrease, Stay the Same

Back

Increase

Front

Did the lemming population begin to increase, decrease, or stay the same in 1990?

Back

Decrease

Front

What pattern in the weasel population begins during the year following 1990? Options: Increase, Decrease, Stay the Same

Back

Decrease

Front

What causes a predator's population size to decrease?

Back

Decrease in prey population