Ecology Review

Which of the following best describes the role of producers in a food chain?

• They decompose organic material.

• They convert solar energy into chemical energy through photosynthesis.

• They consume other organisms for energy.

• They are at the top of the food chain.

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DOK Level 2: Skill/Concept

How does the removal of a keystone species, such as a top predator, typically affect an ecosystem?

• It leads to an increase in biodiversity.

• It causes a trophic cascade that can destabilize the ecosystem.

• It has no significant impact on the ecosystem.

• It results in the immediate extinction of all species in the ecosystem.

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DOK Level 2: Skill/Concept

Which of the following is an example of mutualism in an ecosystem?

• A lion hunting a zebra.

• A bee pollinating a flower.

• A tapeworm living in a host's intestine.

• A bird eating ticks off a rhinoceros.

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DOK Level 2: Skill/Concept

In the carbon cycle, which process is primarily responsible for removing carbon dioxide from the atmosphere?

• Respiration

• Photosynthesis

• Combustion

• Decomposition

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DOK Level 2: Skill/Concept

Explain how biodiversity contributes to the stability of an ecosystem.

• Biodiversity increases competition, leading to the extinction of weaker species.

• Biodiversity provides a variety of genetic resources that can help ecosystems recover from disturbances.

• Biodiversity decreases the number of available niches, leading to a more stable ecosystem.

• Biodiversity has no impact on ecosystem stability.

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DOK Level 3: Strategic Thinking

What is the primary impact of climate change on polar biomes?

• Increased biodiversity due to warmer temperatures.

• Melting ice caps leading to habitat loss for species like polar bears.

• Expansion of polar biomes due to colder temperatures.

• Increased precipitation leading to more freshwater availability.

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DOK Level 2: Skill/Concept

Analyze the impact of deforestation on the carbon cycle.

• Deforestation increases the amount of carbon stored in trees.

• Deforestation decreases atmospheric carbon dioxide levels.

• Deforestation increases atmospheric carbon dioxide levels by reducing the number of trees that can absorb CO2.

• Deforestation has no impact on the carbon cycle.

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DOK Level 3: Strategic Thinking

Which of the following best describes a commensal relationship?

• Both species benefit from the interaction.

• One species benefits while the other is harmed.

• One species benefits while the other is neither helped nor harmed.

• Both species are harmed by the interaction.

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DOK Level 2: Skill/Concept

Evaluate the role of decomposers in the food web.

• Decomposers are primary producers that create energy for the ecosystem.

• Decomposers break down dead organisms, returning nutrients to the soil and supporting plant growth.

• Decomposers are top predators that control the population of herbivores.

• Decomposers have no significant role in the food web.

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DOK Level 3: Strategic Thinking

How does an increase in atmospheric carbon dioxide levels affect ocean biomes?

• It leads to more CO2 in the ocean and acidifies it , which can harm marine life.

• It increases the salinity of ocean water.

• It decreases the temperature of ocean water.

• It has no effect on ocean biomes.

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DOK Level 2: Skill/Concept