Ecosystems Test

 A rabbit depends on various plants in an ecosystem to survive. Which

would most likely happen if a drought decreased the plant population?

• A. The rabbit population would increase.

• B. The rabbit population would decrease.

• C. The rabbit population would remain the same.

• D. The rabbit population would increase, then decrease quickly.

22. This diagram shows a simple ocean food chain.

algae → fish → seal

Which will most likely occur if the fish population decreases?

• A. The algae and seal populations will increase.

• B. The algae and seal populations will decrease.

• C. The algae population will increase, and the seal population will

  increase.

• D. The algae population will increase, and the seal population will

  decrease.

23. The diagram below is a simple grassland food chain.

grass -----> mouse------> snake

If a predator of the snake were introduced to the ecosystem, which would

most likely happen?

• A. The grass population would increase.

• B. The snake population would increase.

• C. The mouse population would increase.

• D. The mouse population would decrease.

24. Which is an example of a terrestrial organism relying on an aquatic

organism for food?

• A. Eagles consume fish to survive.

• B. Birds consume worms to survive.

• C. Fish consume seaweed to survive.

• D. Frogs consume flying bugs to survive.

25. Which ecosystem would most likely be home to crabs and oysters?

• A. estuary

• B. forest

• C. grassland

• D. lake

26. Which best describes the differences between an ocean and a lake

ecosystem?

• A. an ocean ecosystem is brackish water; a lake ecosystem is freshwater

• B. an ocean ecosystem is salt water; a lake ecosystem is brackish water

• C. an ocean ecosystem is salt water; a lake ecosystem is freshwater

• D. an ocean ecosystem is freshwater; a lake ecosystem is salt water

27. Which two ecosystems contain saltwater organisms?

• A. lakes and ponds

• B. oceans and ponds

• C. estuaries and lakes

• D. oceans and estuaries

28, Which characteristic differs the most between a forest and a grassland

ecosystem?

• A. the amount of salt

• B. the amount of trees

• C. the amount of sunlight

• D. the amount of organisms

29. Which ecosystem most likely receives the greatest amount of

precipitation?

• A. estuary

• B. grassland

• C. rain forest

• D. salt marsh

30. CIRCLE ALL CORRECT ANSWERS: Which of the following are considered limiting factors?

• A. excess (a lot of) water

• B. fire

• C. disease

• D. severe weather