Changes in Ecosystems 5.9C

Who is the producer in this illustration?

• The native grass

• The black-tailed prairie dog

• The Sun

• The black-footed ferret

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3. Why are native grasses in the Blackland Prairie better for the ecosystem than nonnative species?

• Native grasses have longer roots and prevent erosion.

• Native grasses have longer stems and catch fire easily.

• Native grasses have been in the ecosystem for a long time.

• Native grasses are better for cattle.

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3. Who are the primary consumers in this illustration?

• The native grasses

• The cottontails and the prairie dogs

• The armadillos, the burrowing owl, the swift fox, and the hawk

• The native grasses, the cottontails, and the swift fox

4. A pesticide intended to wipe out insects, is sprayed in an ecosystem. What could happen to a population of bats that feeds on insects?

• The population of bats will increase.

• The population of bats will decrease.

• The population of bats will increase, and then decrease.

• The population of bats will stay the same.

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5. How can humans coexist with ecosystems, without destroying them?

• By being mindful of how we use them.

• By not using them.

• By restoring them after they have been destroyed.

• By replacing them.

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6. What are the elements that make up an ecosystem?

• Sun, producer, primary consumer, and secondary consumer

• All the living and nonliving things that interact in an environment

• Species, exotic species, and the species that are extinct

• The American bison, the black-footed ferret, and the prairie dog

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7. Who is the secondary consumer in this illustration?

• The native grass

• The black-tailed prairie dog

• The Sun

• The black-footed ferret

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8. What would happen to the producers in an ecosystem, if the main predator of the primary consumers is removed?

• Producer population will decrease.

• Producer population will increase.

• Producer population will increase, then decrease.

• Producer population will not change.

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NGSS.MS-LS2-4

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9. An exotic species of frog has outlived a native frog species in a lake. Which of the following is NOT a possible cause?

• The exotic frog has no predators in the lake.

• The exotic frog is successful at finding food in the lake.

• The exotic frog cannot find food in the lake.

• The exotic frog has found safe shelter in the ecosystem.

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NGSS.MS-LS2-4

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10. Humans can negatively affect ecosystems in all the following ways, except by _______

• polluting them

• introducing exotic species

• removing predators

• conserving them

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