Question 1

What would most likely happen to the populations of organisms in the forest ecosystem if there were no rain for a very long time?

Accepted Answer

D. The populations of all the forest organisms would decrease because producers would not be able to survive to supply nutrients to the consumers.

Answer

A. The grass and tree populations would increase because they only need sunlight and soil to get nutrients.

Answer

B. The populations of all the forest organisms would remain the same because water only affects other nonliving factors.

Answer

C. The hawk and rabbit populations would increase because they would not have to compete with grass and tree populations for water.

Question 2

Developers cleared a small forest to build an apartment complex near Marie's house. As a result, the amount of habitat for hawks decreased significantly. Since hawks eat mice, what is most likely to happen to the population of mice now that the hawks have fewer places to live?

Accepted Answer

C. The population of mice will increase.

Answer

D. The population of mice will decrease.

Answer

B. The population of mice will remain the same.

Answer

A. The population of mice will move to another area.

Question 3

How would a prey species most likely be affected if disease killed most of the predator species?

Accepted Answer

D. The prey population would increase.

Answer

B. The prey population would need to find other food.

Answer

A. The prey population would decrease.

Answer

C. The prey population would start hunting the predators.

Question 4

In a forest ecosystem, a disease killed many of the rodents. Which of the following is most likely to occur after this happens?

Accepted Answer

A. The numbers of owls will decrease.

Answer

B. The plant population will decrease.

Answer

C. The insect population will decrease.

Answer

D. The number of deer will decrease.

Question 5

Use the photograph below to help you answer the question.

Accepted Answer

A. Parts of the community would have less shade.

Answer

B. The consumers in the community that depends on trees will have to find another producer that will meet their needs.

Answer

D. The consumers in the community would decrease as they would not have anything to eat.

Answer

C. The consumers in the community that depends on trees will begin depending on other decomposers to fill the void of the smallest trees.

Question 6

A student made a model of a food web in Australia.

A widespread forest fire burned down most of the eucalyptus trees. How would this affect the community?

Accepted Answer

C. The koala population would also go down because they would have no food to eat, therefore, also decreasing the dingo population since they would have less koalas to eat.

Answer

D. The kangaroo population would also go down because they would not have any food to eat, therefore, also decreasing the dingo population since they would have less kangaroos to eat.

Answer

A. The community would remain unaffected. There is still another producer that the consumers can all eat.

Answer

B. The koala population would also go down because they would have no food to eat, but the rest of the ecosystem will be unaffected.

Question 7

The table shows the basic needs of a robin.

Accepted Answer

C. Humans cutting down trees to build houses.

Answer

B. Beavers building a dam to create a pond.

Answer

D. Ants building large anthills in a schoolyard.

Answer

A. Prairie dogs digging tunnels in the ground.

Question 8

The graph shows the sizes of two populations. The hare is the prey, and the lynx is the predator.

Using the graph, which statement describes the changes in the ecosystem between 1910-1913?

Accepted Answer

A. When the population of the hare became over-abundant, the population of the lynx also increased.

Answer

C. When the population of the hair became scarce, the population of the lynx increased.

Answer

B. When the population of the hare became over-abundant, the population of the lynx decreased.

Answer

D. When the population of the hare became scarce, the population of the lynx stayed stable.

Question 9

If a species of predator is removed from an environment, the population of prey animals

Accepted Answer

A. will increase.

Answer

B. will decrease.

Answer

C. will be the same.

Answer

D. will disappear.

Question 10

The table shows organisms in an ecosystem and what they eat, which transfers energy between them.

Which organisms would receive less energy if rabbits were removed from the ecosystem?

Accepted Answer

C. hawks and wolves

Answer

D. snakes and hawks

Answer

B. wolves and mice

Answer

A. mice and snakes

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