Unit 2 Test : Sustainability And Biodiversity

26 Questions  I  By 1997love

  
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1.  Biodiversity is the variety of ecosystems on Earth
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2.  Deforestation is when forests are logged or cleared for human use and never are replenished (Ex. To build houses)
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3.  We know all the species on the Earth
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4.  Habitat loss occurrs when events, due to natural disaters ( Volcanoes, droughts, wild fires, storms) or human activities, alter an ecosystem so dramatically the many species can no longer survive there. 
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5.  Alien species are species introduced to a new part of the biosphere from another area of the biosphere and may have negative effects on the new surroundings, although they may be harmless. They may be released or arrive accidently into the new enivronment.
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6.  Zebra Muscles didn't have a negative effect on the ecosystem in Canada.
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7.  Overexploitation is the use or extraction of a resource until it is depleted. This may lead to extremly low population numbers or the eventual extinction on the species.
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8.  Extinction occurs when all of the individual of a particular species have remained alive.
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9.  Extinction occurs when the death rate of a species remains:
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10.  Backround extinction occurs over a long period of time as ecosystems gradually change. Some existing species become extinct while new species appear through evolution.
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11.  Mass extinction occurs when there is a relatively sudden change to an ecosystem making it unsustainable.
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12.  Extripated means when a species no longer is present in one area but may be found in other areas.
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13.  Endangerment occurs when the population of animals are thriving and have very high numbers.
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14.  A steward is someone who is resonsible for looking after someone else's property.
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15.  What does "Environmental Stewardship" mean?
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16.  ______________ species is on that can greatly affect the                                 numbers and the overall health of an ecosystem. Keystone species may be either                                 or                               and are generally not very abundant.
17.  A ecosystem could have a great chance of remaining sustainable even if 2 to 3 species were loss.
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18.  Restoring altered ecosystems is the renewal of degraded or destroyed ecosystems through human intervention.
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19.  Restoration methods are:
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20.  What is reforestation?
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21.  The Canadian government and organization do not care about the wetlands and are doing nothing to support
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22.  Alien species are being controled by:
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23.  Bioaugmentation is the use of organisms to add essential nutrients to depleted soil  Ex. Clover is often planted to replenish nitrogen levels in the soil.
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24.  Bioremediation is when scientists introduce living plants and fungi to 'clean' the soil in an are that has toxic soil levels, improving the soil quality.
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25.  A population is a group of organisms of _______________ that lives in the  _______________ at the _______________ , and can _____________________________.   
26.  Populations tend to decrease when individuals reproduce at rates that are greater than what is needed to replace individuals that have left or died.
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