Food Web Lab Quiz - B retake

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 rabbis will decrease.
• 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 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? What would cause the grass to decrease and everything else to decrease?

• A disease in the population of rabbits.
• A disease in the population of snakes.
• A disease in the population of hawks.

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

• A decreasing population of grasses.
• An increasing population of hawks.
• A higher than normal population of snakes.

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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.

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All energy in an ecosystem comes from the __________.

• producers
• sun
• consumers

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Using the ecological pyramid, which organism is a producer?

• Snake
• Grass
• Rabbits

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Using the food web, which of the following is a tertiary (3rd level) consumer?

• Grasshopper
• Dragonfly
• Plantain

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Using the food web, which of the following is an omnivore?

• Butterfly
• Buzzard
• Titmouse

Which of the following is NOT a biotic factor?

• Trees
• Water
• Squirrel