Unit 5 Biodiversity and Extinction

Which of these human activities is impacting global biodiversity?

• Overfishing

• Deforestation (cutting down forests)

• Creating dams for power

• Growth of urban centers (cities)

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The area of our planet with life is called the

• Asthenosphere

• Lithospshere

• Mesosphere

• Biosphere

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The permanent loss of large numbers of species over a relatively short period of geological time is known as

• a big problem.

• a diversity shift.

• an extinction event.

• a single point loss.

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A biodiversity hotspot is

• an area with higher temperatures than the surrounding areas.

• an area with low biodiversity that needs protection.

• an area of rich biodiversity that faces serious threats to its existence.

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What is biodiversity?

• All life on the planet.

• The number of organisms in a specific ecosystem.

• The total variety of all life on Earth.

• The variety of animals on Earth.

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Forest clearing, farming, and road building are all examples of

• Biodiversity

• Population distribution

• Habitat loss

• Climate Change

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Biodiversity contributes to habitat sustainability because

• Changing conditions that harm one species leave other species to survive and perhaps even thrive.

• The greater the number of species, the more competition there is for food between predators, which sustains their populations

• The more plants and animals in a habitat, the greater the links in food webs allowing for more stable system

• It will be more prone to disturbances

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When taken to a new habitat, non-native plants often threaten native plants of the new habitat.  Why do they do this?

• Non-native plants are able to mutate rapidly
• Non-native  plants cause native animals to relocate
• Non-native plants are able to be used for medicine
• Non-native plants compete with native plants for resources

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Invasive species alter the ecosystem by _____ in number quickly. This leads to _____ food for the native species.

• increasing, less

• increasing, more

• decreasing, less

• decreasing, more

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What is an invasive species?

• A native (naturally found) species which are added to an area. 
• A non-native (not naturally found) species added to an area. 
• A keystone species in an environment
• none of the above

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