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5 Written questions

5 Matching questions

  1. Which of the following statements about keystone species is NOT true?
    A. The extinction of keystone species can lead to other extinctions and a loss of biodiversity.
    B. Keystone species are defined as a population subdivided into several small isolated populations due to habitat fragmentation.
    C. Examples of keystone species are grizzly bears, bats, beavers and alligators.
    D. The numbers of individuals in the keystone species in their respective community may or may not be excessively high.
  2. A _______ population survives in unfavorable conditions, has a birthrate that barely equals the death rate, and receives new members from other fragmented populations.
    A. keystone
    B. sink
    C. meta
    D. exotic
    E. source
  3. Conservation biology supports all of the following ethical principles EXCEPT
    A. biodiversity is desirable for the biosphere and humans.
    B. all animals have the same rights or legal status as humans.
    C. biodiversity has value in and of itself regardless of any practical human benefits.
    D. extinctions due to human actions are undesirable.
    E. the complex interactions of ecosystems support biodiversity and are desirable.
  4. The effect of global warming on coral reefs is
    A. negligible, since they will be protected underwater.
    B. minor since all marine environments are moderated by the great ability of water to hold temperatures constant.
    C. negative, since a rise of a few degrees will cause them to bleach and become lifeless.
    D. positive, since the higher temperatures will increase photosynthesis in the mutualistic algae.
    E. positive, since the greater sunlight to penetrate the sea will increase photosynthesis in the mutualistic algae.
  5. _______ is (are) associated with 85% of the cases of threatened and endangered species.
    A. Pollution
    B. Habitat loss
    C. Overexploitation
    D. Disease
    E. Exotic species
  1. a B. sink
  2. b B. Keystone species are defined as a population subdivided into several small isolated populations due to habitat fragmentation.
  3. c C. negative, since a rise of a few degrees will cause them to bleach and become lifeless.
  4. d B. Habitat loss
  5. e B. all animals have the same rights or legal status as humans.

5 Multiple choice questions

  1. False
  2. E. C and D are incorrect.
  3. C. generally negative, with 11 of the 15 major oceanic fishing areas overexploited.
  4. C. consumptive use
  5. D. No; as with all complex systems, it is a matter of proportion; the current trend towards atmospheric pollution is far beyond the Earth's normal low level of natural fires, the effects of which were easily handled.

5 True/False questions

  1. Which of the following are of extinction?
    A. habitat loss
    B. exotic species
    C. pollution
    D. A, B, and C only are correct.
    E. A and C only are correct.
    D. A, B, and C only are correct.

          

  2. The greenhouse effect is
    A. due to increased sunlight in recent years.
    B. caused by increased plant life and photosynthesis.
    C. a natural phenomenon due to absorption of sunlight and re-radiating of the heat.
    D. a manmade hazard due to decreased levels of carbon dioxide and ozone in the atmosphere in recent years.
    E. All of the choices are correct.
    C. a natural phenomenon due to absorption of sunlight and re-radiating of the heat.

          

  3. When habitats are fragmented so that populations are subdivided into several small and isolated groups, they form a
    A. sink population.
    B. biodiversity hotspot.
    C. keystone species.
    D. source population.
    E. metapopulation.
    E. metapopulation.

          

  4. Global warming
    A. is an increase in the average temperature of the Earth.
    B. may cause a rise in the sea level that will inundate coastal wetlands.
    C. may cause extinction of some land organisms, but biodiversity may increase.
    D. is increased by elevated levels of greenhouse gasses in the atmosphere.
    E. All of the choices are correct.
    C. a natural phenomenon due to absorption of sunlight and re-radiating of the heat.

          

  5. Nitrogen oxides from automobile exhaust and sulfur dioxides from power plants combine with atmospheric water vapor to produce a weak acids, that may result in
    A. the greenhouse effect.
    B. ozone depletion.
    C. acid rain or snow.
    D. photochemical smog.
    E. global warming.
    C. acid rain or snow.