Test Review Unit 6 3.21.35

What happens if a primary consumer in a food web decreases in population?

• The population of producers will increase.

• The population of secondary consumers will increase.

• The population of secondary consumers will decrease.

• The ecosystem will remain unchanged.

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How would the removal of a top predator affect an ecosystem?

• Prey populations would increase.

• Prey populations would decrease.

• Producers would decrease.

• Nothing would change.

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If a disease wipes out a producer population, how would the ecosystem change?

• Herbivores would increase.

• Carnivores would thrive.

• Consumers would struggle due to lack of food.

• New producers would immediately take over.

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Why are invasive species harmful to ecosystems?

• They increase biodiversity.

• They have no natural predators and outcompete native species.

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How can an invasive species outcompete native species?

• By reproducing slowly and using fewer resources.

• By having natural predators that control their population.

• By growing without limit due to lack of predators.

• By forming partnerships with native species.

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What would happen to a food web if a predator species was introduced with no natural enemies?

• The predator population would decrease.

• The predator would help balance the food web.

• The predator population would grow unchecked, disrupting the ecosystem.

• The ecosystem would become more stable.

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What is the first type of organism to colonize bare rock in primary succession?

• A) Trees

• B) Grasses

• C) Lichens and mosses

• D) Small shrubs

How does secondary succession differ from primary succession?

• A) Secondary succession starts with bare rock.

• B) Primary succession occurs after natural disasters.

• C) Secondary succession begins with some soil already present.

• D) Primary succession is faster.

What type of succession would occur after a volcanic eruption covers an area with lava?

• Primary succession

• Secondary succession

• Tertiary succession

• No succession would occur

Why is biodiversity important for an ecosystem’s health?

• It makes ecosystems less stable.

• It increases ecosystem sustainability.

• It reduces available food sources.

• It decreases survival chances of organisms.

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