Population Ecology 2

16 Questions

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Ecology Quizzes & Trivia

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Questions and Answers
  • 1. 
    An example of a density-dependent factor that influences the size of a population is:
    • A. 

      Competition

    • B. 

      Predation

    • C. 

      A fire

    • D. 

      Two of the responses are correct

    • E. 

      All of the responses are correct

  • 2. 
    A typical r-selected organism might be a(n)                 ; a K-selected organism might be a(n)                   .
    • A. 

      Mouse, elephant

    • B. 

      Elephant, mouse

    • C. 

      Mouse, rabbit

    • D. 

      Rabbit, fly

    • E. 

      Rabbit, mouse

  • 3. 
    Generally r-selected organisms exhibit:
    • A. 

      Short life spans and little parental care of offspring

    • B. 

      Long life spans extended parental care of offspring

    • C. 

      Long development time to maturity, but small body size

    • D. 

      Large body size and extended parental care of offspring

    • E. 

      Large body size, but short life spans

  • 4. 
    Species that show a type I survivorship curve would be expected to:
    • A. 

      Be K-selected

    • B. 

      Have high mortality early in life

    • C. 

      Have constant mortality throughout life

    • D. 

      Have high mortality late in life

    • E. 

      Two responses are correct

  • 5. 
    Organisms such as oysters or fish that produce millions of eggs per year may be characterized as:
    • A. 

      R-selected and having a type I survivor-ship curve

    • B. 

      K-selected and having a type I survivor-ship curve

    • C. 

      R-selected and having a type II survivor-ship curve

    • D. 

      K-selected and having a type II survivor-ship curve

    • E. 

      R-selected and having a type III survivor-ship curve

  • 6. 
    In a population characterized by type III survivor-ship, the probability of survival with age.
    • A. 

      Increases

    • B. 

      Decreases

    • C. 

      Does not change

    • D. 

      Is variable

    • E. 

      None of the responses are correct

  • 7. 
    Pest or weedy species are typically                  and exhibit         survivor-ship curves
    • A. 

      R-selected, I

    • B. 

      R-selected, II

    • C. 

      R-selected, III

    • D. 

      K-selected, I

    • E. 

      K-selected, III

  • 8. 
    Compare and contrast r-selected and K-selected organisms. Give one example of each.
  • 9. 
    Natural selection involves energetic trade-offs between or among life history traits such as:
    • A. 

      Number of offspring per reproductive episode

    • B. 

      Number of reproductive episodes per lifetime

    • C. 

      Age at first reproduction

    • D. 

      Only A and C are correct

    • E. 

      A, B and C are correct

  • 10. 
    Which of the following is a density-independent factor limiting human population growth?
    • A. 

      Social pressure for birth control

    • B. 

      Earthquakes

    • C. 

      Plagues

    • D. 

      Famines

  • 11. 
    Which survivor-ship curve is typical of organisms like deciduous trees that experience a high early mortality and, once established, manage to live a long time?
    • A. 

      Type I

    • B. 

      Type II

    • C. 

      Type III

    • D. 

      None of these are correct

  • 12. 
    The type I survivor-ship curve is typical for modern humans living in industrialized societies. What type of survivor-ship curve is characteristic of humans long ago, or that probably occurs in impoverished underdeveloped countries?
    • A. 

      Type I

    • B. 

      Type II

    • C. 

      Type III

    • D. 

      None of these are correct

  • 13. 
    Define the terms primary and secondary ecological succession.
  • 14. 
    Life history traits reflect evolutionary adaptations of reproduction strategies and age-specific distribution of reproduction and mortality. For each of these adaptations describe 2 examples.
  • 15. 
    Carrying capacity can not be dynamic
    • A. 

      True

    • B. 

      False

  • 16. 
    Which of the following can contribute to density-dependent regulation of populations?
    • A. 

      The accumulation of toxic wastes

    • B. 

      Intraspecific competition for nutrients

    • C. 

      Predation

    • D. 

      All of the above

    • E. 

      None of the above