Chapter 7.2 Quiz Review

How many times has mass extinctions happened in Earth’s history?

• 3

• 4

• 5

• 6

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What is an endangered species?

• One that is at serious risk of extinction

• One that is likely to become endangered soon throughout all or part of its range

• One that is safe from extinction

• One that no longer exists.

What is the background rate of extinction?

• 1 of every 1,000 mammal species would typically go extinct every 1,000-10,000 years

• 1 of every 100 mammal species would typically go extinct every 1,000-10,000 years

• 1 of every 10 mammal species would typically go extinct every 1,000-10,000 years

• 1 of every 1,000 mammal species would typically go extinct every 100-1,000 years

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What does the Living Planet Index summarize?

• Population trends for a set number of terrestrial, freshwater, and marine species

• Population trends for a set number of terrestrial species

• Population trends for a set number of marine species

• Population trends for a set number of freshwater species

What is a threatened species?

• One that is at serious risk of extinction

• One that is likely to become endangered soon throughout all or part of its range

• One that is safe from extinction

• One that has become extinct

Answer explanation

Which factor is NOT a direct cause of species extinction?

• Habitat destruction

• Pollution

• Climate change

• Natural selection

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What role do keystone species play in an ecosystem?

• They are the most abundant species in an ecosystem

• They have a disproportionately large effect on their environment relative to their abundance

• They are the primary producers in a food chain

• They are species introduced from other ecosystems

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What is the primary goal of conservation biology?

• To increase the land used for agriculture

• To study the evolution of plants and animals

• To protect and restore biodiversity

• To promote the sustainable use of resources

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Which of the following is a primary cause of biodiversity loss?

• Increased urbanization

• Renewable energy development

• Decreased pollution levels

• Conservation efforts

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What is the significance of genetic diversity within a species?

• It ensures uniformity across individuals.

• It decreases the species' adaptability to environmental changes.

• It increases the species' resilience to diseases and environmental changes.

• It has no impact on the species' survival.

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