Biology 172 Quiz 18: Ecological Principles

  1. A population in r-phase growth exhibits the following population size changes (see table below). What would the population size be in year 4?
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    B. 162
  2. According to the Competitive Exclusion Principle 




    E. no two similar species can occupy the same niche at the same time in the same place
  3. In a typical ecosystem, the second trophic level consists of 




    D. herbivores
  4. In the carbon cycle, the decomposers utilize ______ as their primary source of carbon. 




    D. organic carbon from dead organic matter
  5. The concept of trophic structure of a community emphasizes the 




    D. feeding relationships within a community
  6. The niche of an organism is best defined as that organism's 




    A. "profession" or role in the ecosystem
  7. When an ecosystem develops on a new or highly altered surface (e.g., lava flow or burned-down forest floor) and then is transformed through time, eventually reaching an equilibrium, climax state, the phenomenon is know as




    C. ecological succession
  8. Which biome type is characterized by the following features: midlatitudes, somewhat coastal, seasonal rainfall with occasional long dry spells, cool winters & hot summers? Note, this biome is dominated by drought resistant shrubs and trees. 




    B. chaparral
  9. Which component of the nitrogen cycle converts N2 into forms of nitrogen useable by plants?




    D. nitrogen-fixers
  10. Which of the following best describes the fate of energy in an ecosystem? 




    A. Energy is degraded into a form less capable of doing work by living things (e.g., light is converted to heat).
  11. You are most likely to find a species within its _______ of an environmental gradient.




    A. optimum range
  12. Density-dependent factors influencing population growth include 




    E. all of these
  13. The classic S-shaped logisitic population growth curve equation incorporates which of the following variables? 
    A.the intrinsic rate of increase (r) 
    B.the carrying capacity (K) 
    C.age at first reproduction
    D.both A & B above 
    E.answers A, B & C above
    Answer Key: D
  14. Which ecosystem type is LEAST subject to failure if one of its species is removed? 




    E. tropical rainforest
  15. Which of the following is a biotic factor influencing the success of a species? 




    E. competition with other species
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Biology 172 Quiz 18: Ecological Principles
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Biology 172 Quiz 18: Ecological Principles
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