Threats to Biodiversity - 5.2

Biodiversity refers to

• extinct species

• the variety of species in an ecosystem

• nonrenewable resources

• the rate of species decline

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Populations of invasive species grow so quickly because

• Invasive Species are native to an area.

• Invasive species are prey to many animals.

• Invasive species have no natural predators.

• Invasive species keep the ecosystems in equilibrium.

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An endangered species is

• One whose numbers are so small that it is at risk of extinction
  
• One whose not been spotted after many years.
• One whose numbers are abundant.

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The loss of a natural habitat is called

• Habitat development

• biodiversity

• Pollution

• Habitat destruction

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Ozone depleting substances have been depleting the ozone layer since the 1970’s. Which example could be classified as a result of a hole in the ozone layer?

• Less rainfall occurs over the Indian Ocean

• More ultraviolet radiation reaches Earth’s surface

• More pollution is released into Earth’s atmosphere

• Ocean current circulation has been greatly affected

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Greenhouse gases have environmental impacts on marine ecosystems. Which environmental impact is NOT a result of greenhouse gases?

• global warming

• sea level rise due to glacial melting

• cooling of arctic waters

• coral bleaching due to the acid rain

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Fossil fuels such as coal, oil, and natural gas supply much of the world's energy. However, these fuels have a tremendous negative effect on the environment. Which of the following would be the best strategy to alleviate this problem?

• Impose fines on individuals that overuse fossil fuels and use the money for environmental cleanup.

• Educate society on the harmful effects and gradually replace fossil fuels with alternative renewable resources.

• Fund scientific research for discovering new energy sources and use the remaining supply of fossil fuels until then.

• Create an environmental policy that would ban the use of all fossil fuels due to the negative environmental effects.

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When excess nutrients make their way into the waterways in runoff from lawns:

• fish populations increase
• algal blooms increase
• frog population increases
• people get more vitamins in their water

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The separation or breaking of habitats into smaller pieces is called

• habitat division

• habitat pollution

• habitat corruption

• habitat fragmentation

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Why is biodiversity so important?

• Because all species depend on each other to survive, so if one becomes extinct another species that relies on it could go extinct as well
• Because it’s better to have only one variation of each species.
• Because it better to only have a few species on Earth.
• Honestly, I have no idea what biodiversity is!

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