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Biology Unit 3: Communities: 7 Test

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5 Written Questions

5 Matching Questions

  1. evenness
  2. keystone species
  3. parasitism
  4. communities
  5. herbivory
  1. a All the organisms that inhabit a particular area; an assemblage of populations of different species living close enough together for potential interaction
  2. b A symbiotic relationship in which the symbiont (parasite) benefits at the expense of the host by living either within the host (as an endoparasite) or outside the host (as an ectoparasite)
  3. c consumption of plants
  4. d Species that are not usually abundant in a community yet exert strong control on community structure by the nature of their ecological roles or niches
  5. e A mathematical measure of how the total number of individuals in an area are divided among the number of species in an area. In even communities, most species have about the same number of individuals present, where in uneven communities almost all individuals present belong to one species.

5 Multiple Choice Questions

  1. Predicts the relationship between species richess of a patch and that patch's area and distance to other patches
  2. A type of ecological succession that occurs in a virtually lifeless area, where there were originally no organisms and where soil has not yet formed
  3. The concept that when populations of two similar species compete for the same limited resources, one population will use the resources more efficiently and have a reproductive advantage that will eventually lead to the elimination of the other population
  4. A defense where one species is selected to look like another species which has an effective defense.
  5. A force that changes a biological community and usually removes organisms from it. Disturbances, such as fire and storms, play pivotal roles in structuring many biological communities

5 True/False Questions

  1. nicheThe simple count of number of species in an area.


  2. ecological successionA type of succession that occurs where an existing community has been cleared by some disturbance that leaves the soil intact


  3. commensalismA symbiotic relationship in which the symbiont benefits but the host is neither helped nor harmed


  4. richnessThe simple count of number of species in an area.


  5. predationAn interaction between species in which one species, the predator, eats the other, the prey


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