Ecosystem Interactions and Predictions Quiz

In a terrestrial ecosystem, which trophic level contains the most energy and biomass at any given time?

• Primary consumers

• Secondary consumers

• Producers

• Decomposers

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Explain how decomposers contribute to the cycling of matter in an ecosystem.

• They consume producers and release energy as heat.

• They break down waste and dead organisms, returning nutrients to the soil or water.

• They produce energy through photosynthesis.

• They store energy in the form of biomass.

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If a disease significantly reduces the population of primary consumers in an ecosystem, what is a likely consequence for the producers?

• Producers will increase due to less predation.

• Producers will decrease due to increased competition.

• Producers will remain unaffected.

• Producers will decrease due to less energy flow.

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What is the primary role of producers in an ecosystem?

• To decompose organic matter

• To convert solar energy into chemical energy

• To consume other organisms

• To recycle nutrients

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Describe the flow of energy in a food chain starting from producers.

• Energy flows from decomposers to producers to consumers.

• Energy flows from consumers to producers to decomposers.

• Energy flows from producers to consumers to decomposers.

• Energy flows from consumers to decomposers to producers.

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How might an increase in the population of secondary consumers affect the primary consumers in an ecosystem?

• Primary consumers will increase due to more available food.

• Primary consumers will decrease due to increased predation.

• Primary consumers will remain stable.

• Primary consumers will decrease due to less competition.

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What happens to the energy that is not used for growth or homeostasis in an organism?

• It is stored indefinitely.

• It is lost to the environment as waste and heat.

• It is converted into biomass.

• It is recycled back to the producers.

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Why is the biomass of producers typically greater than that of higher trophic levels in an ecosystem?

• Producers have more efficient energy conversion.

• Energy is lost at each trophic level due to waste and heat.

• Producers reproduce more quickly than consumers.

• Consumers do not contribute to biomass.

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Predict the impact on an ecosystem if decomposers were removed.

• Nutrient cycling would increase.

• Waste and dead matter would accumulate, disrupting nutrient cycling.

• Producers would thrive due to more available nutrients.

• Energy flow would increase.

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Which of the following best describes the role of consumers in an ecosystem?

• They produce energy through photosynthesis.

• They break down organic matter into simpler compounds.

• They obtain energy by feeding on other organisms.

• They recycle nutrients back to the producers.

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