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5 Written questions

5 Matching questions

  1. Some aquatic ecosystems have inverted biomass pyramids, in which primary consumers outweigh the producers. Why is it that a pyramid of biomass, but not a pyramid of net production, may be inverted?

    A pyramid of biomass may be inverted because it is based on biomass at one point in time. Pyramids of net production are based on productivity per unit time.
    A pyramid of biomass may be inverted when the producers (e.g., phytoplankton) are much more plentiful than the consumers (e.g., zooplankton). Producers are always outnumbered by consumers, so pyramids of net production are never inverted.
    A pyramid of biomass may be inverted when the producers (e.g., phytoplankton) are much smaller than the consumers (e.g., zooplankton). Producers always have higher productivity than consumers, so pyramids of net production are never inverted.
  2. Which of the following organisms is incorrectly paired with its trophic level?

    eagle-tertiary consumer
    fungus-detritivore
    cyanobacterium-primary producer
    zooplankton-primary producer
    grasshopper-primary consumer
  3. Consider a population whose growth over a given time period can be described by the exponential model: dN/dt = rN. Select the correct statement about this population.

    A population with an r of 0 will have no births or deaths during the time period under consideration.
    A population with a positive value of r will grow exponentially.
    A population with an r of 0.1 will decrease over time.
  4. Which of these ecosystems has the lowest net primary production per square meter?

    a tropical rain forest
    a salt marsh
    an open ocean
    a grassland
    a coral reef
  5. The oceans affect the biosphere in all of the following ways except

    producing a substantial amount of the biosphere's oxygen.
    moderating the climate of terrestrial biomes.
    removing carbon dioxide from the atmosphere.
    regulating the pH of freshwater biomes and terrestrial groundwater.
    being the source of most of Earth's rainfall.
  1. a an open ocean
  2. b regulating the pH of freshwater biomes and terrestrial groundwater.
  3. c A pyramid of biomass may be inverted because it is based on biomass at one point in time. Pyramids of net production are based on productivity per unit time.
  4. d A population with a positive value of r will grow exponentially.
  5. e zooplankton-primary producer

5 Multiple choice questions

  1. addition of new syllables to a canary's song repertoire.
  2. iteroparous; K-selected
  3. restoration ecology.
  4. the ecological footprint of the United States is large because per capita resource use is high.
  5. landscape ecology

5 True/False questions

  1. The most plausible hypothesis to explain why species richness is higher in tropical than in temperate regions is that

    tropical communities are younger.
    tropical regions have very high rates of immigration and very low rates of extinction.
    diversity increases as evapotranspiration decreases.
    higher temperatures cause more rapid speciation.
    tropical regions generally have more available water and higher levels of solar radiation.
    tropical regions generally have more available water and higher levels of solar radiation.

          

  2. Scientific study of the population cycles of the snowshoe hare and its predator, the lynx, has revealed that

    the hare population is r-selected and the lynx population is K-selected.
    the prey population is controlled by predators alone.
    both hare and lynx populations are regulated mainly by abiotic factors.
    hares and lynx are so mutually dependent that each species cannot survive without the other.
    multiple biotic and abiotic factors contribute to the cycling of the hare and lynx populations.
    multiple biotic and abiotic factors contribute to the cycling of the hare and lynx populations

          

  3. Which sensory distinction is not encoded by a difference in neuron identity?

    spicy and cool
    red and green
    salty and sweet
    white and red
    loud and faint
    loud and faint

          

  4. Based on the intermediate disturbance hypothesis, a community's species diversity is increased by

    frequent massive disturbance.
    intensive disturbance by humans.
    stable conditions with no disturbance.
    human intervention to eliminate disturbance.
    moderate levels of disturbance.
    When sea urchins were removed from experimental plots, kelp cover increased.

          

  5. Which of the following is characteristic of most terrestrial biomes?

    clear boundaries between adjacent biomes
    a distribution predicted almost entirely by rock and soil patterns
    annual average rainfall in excess of 250 cm
    vegetation demonstrating vertical layering
    cold winter months
    vegetation demonstrating vertical layering