Ecosystems

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 here, 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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What happened to the tree population in this forest?

• The number of trees stayed the same for two years and then began to decrease.

• The number of trees stayed the same for two years and then began to increase.

• The number of trees decreased for two years and then stayed the same.

• The number of trees increased for two years and then stayed the same.

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NGSS.MS-LS2-1

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What happens when the number of producers shrinks?

• The number of consumers increase.

• The number of decomposers increase.

• The number of consumers decrease.

• The number of producers increase.

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What is a primary consumer?

• An organism that eats meat.

• An organism that eats plants.

• An organism that eats dead things.

• An organism that makes it own food.

What is a decomposer?

• An organism that eats meat.

• An organism that eats plants.

• An organism that eats dead things.

• An organism that makes its own food.

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What is a producer?

• An organism that eats meat.

• An organism that makes its own food.

• An organism that eats dead things.

• An organism that eats plants.

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What is a carnivore?

• An organism that eats plants.

• An organism that make its own energy.

• An organism that eats meat.

• An organism that eats dead things.

What is an apex predator?

• An organism that eats plants.

• An organism that has no predators.

• An organism that eats dead things.

• An organism that eats meat.

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