Food chain 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.

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.

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.

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.

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.

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

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

• herbivores

• carnivores

• decomposers

• scavengers

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