Ecosystems Gizmo

If a disease strikes the snake population in the food chain shown, what will be the initial effect on the populations of hawks and rabbits?

• The populations of hawks and rabbits will decrease.

• The populations of hawks and rabbits will increase.

• The population of hawks will increase. The population of rabbits will decrease.

• The population of hawks will decrease. The population of rabbits will increase.

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In the stable food chain shown below, what would you expect to happen initially if you were to suddenly double the population of rabbits?

• The populations of the other three species would also increase.

• The populations of the other three species would decrease.

• The grass population would decrease. The snake population and hawk population would increase.

• The grass population and hawk population would decrease. The snake population would increase.

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What event within the food chain might lead to the graph shown below?

• A disease in the population of rabbits.

• A disease in the population of snakes.

• A disease in the population of hawks.

• It is impossible to tell which of the above occurred.

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NGSS.MS-LS2-1

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What most likely caused the rabbit population to decrease over the first time unit shown in the following graph?

• A disease in the population of rabbits.

• A decreasing population of grasses.

• An increasing population of hawks.

• A higher than normal population of snakes.

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NGSS.MS-LS2-1

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Trapping has severely reduced the population of rabbits in an ecosystem, as shown in the bar graph below. What is the most likely effect this will have on other organisms?

• The snake population will decrease rapidly and the grass population will increase rapidly.

• The hawk population will increase rapidly and the rabbit population will decrease rapidly.

• The grass population will decrease rapidly and the snake population will increase rapidly.

• The grass, rabbit, snake, and hawk populations will all decrease rapidly.

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NGSS.MS-LS2-1

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3. A word that means the same thing as consumer is

• producer

• autotroph

• heterotroph

• carbohydrates

What is at the base of all ecological pyramids?

• consumers

• producers

• decomposers

• scavengers

The removal of which of the following groups would cause an immediate decrease in the amount of energy flowing through the system?

• producers

• decomposers

• consumers

• inorganic nutritions

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What goes in Box 5 of the food web in Figure 3–2?

• herbivores

• carnivores

• decomposers

• scavengers

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Which of the following is the most efficient food chain in the food web shown in Figure 3–4?

• plants, rats, snakes, hawks

• Plants , insect, lizard, snake, hawk

• Plants, quail, coyote

• Plants, Quail, Mountain Lion

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