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5 Written questions

5 Matching questions

  1. 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.
  2. Which of the following may result from resource partitioning?
    Select all that apply.

    A population's fundamental niche may be smaller than its realized niche.
    A population may have a smaller realized niche when it coexists with a competitor.
    Competing species may partition time, feeding at different times of day.
  3. During exponential growth, a population always

    quickly reaches its carrying capacity.
    cycles through time.
    grows at its maximum per capita rate.
    loses some individuals to emigration.
    grows by thousands of individuals.
  4. Plasma membranes of adjacent cardiac muscle cells interlock at specialized regions called intercalated disks. What is the significance of this feature of cardiac muscles?

    The intercalated disks play the same role as striations of skeletal muscle.
    The intercalated disks generate action potentials within the heart muscle without nervous system input.
    The intercalated disks allow coordinated contraction of the whole heart.
  5. The Hubbard Brook watershed deforestation experiment yielded all of the following results except:

    Calcium levels remained high in the soil of deforested areas.
    The flow of minerals out of a natural watershed was offset by minerals flowing in.
    Deforestation increased water runoff.
    Most minerals were recycled within a forest ecosystem.
    The nitrate concentration in waters draining the deforested area became dangerously high.
  1. a grows at its maximum per capita rate.
  2. b Calcium levels remained high in the soil of deforested areas.
  3. c A population may have a smaller realized niche when it coexists with a competitor.
    Competing species may partition time, feeding at different times of day.
  4. d A population with a positive value of r will grow exponentially.
  5. e The intercalated disks allow coordinated contraction of the whole heart.

5 Multiple choice questions

  1. tropical rain forest
  2. The perception of sensory input by humans and star-nosed moles differs.
    The number and type of sensory receptors in humans and star-nosed moles differ.
  3. when hair cells are bent against the tectorial membrane, causing them to depolarize and release neurotransmitter that stimulates sensory neurons
  4. vegetation demonstrating vertical layering
  5. Decomposition rate would decrease and NEP would increase.

5 True/False questions

  1. Keystone predators can maintain species diversity in a community if they

    prey on the community's dominant species.
    allow immigration of other predators.
    reduce the number of disruptions in the community.
    prey only on the least abundant species in the community.
    competitively exclude other predators.
    prey on the community's dominant species.

          

  2. Gray wolves, once the top predators in Yellowstone National Park, were hunted to extinction there in 1926. In 1995, 15 wolves were brought to Yellowstone from Alberta. The wolf population has now grown to 300.
    The forest community in Yellowstone National Park can be described by a top-down model of community organization. Wolves hunt and eat elk. Elk are herbivores that prefer riparian vegetation (plants growing next to streams and lakes). Ravens, bears, and eagles feed on elk carcasses.
    How would you expect the return of the wolves to Yellowstone to affect the other species there?
    Select all that apply.

    Riparian vegetation would decline.
    Elk populations would decline.
    Bear populations would decline.
    regulating the pH of freshwater biomes and terrestrial groundwater.

          

  3. A female zebra finch reared by a father with a red feather taped to his head will select a mate with a similar ornament over an unornamented male. What are plausible ultimate explanations for this behavior?
    Select all that apply.

    A female zebra finch that chooses a mate that resembles her father is more likely to choose a mate from her own species.
    A female zebra finch learns to recognize suitable mates by observing her father.
    Zebra finches are able to perceive ornamentation on other birds.
    When sea urchins were removed from experimental plots, kelp cover increased.

          

  4. Select the correct statement about the factors that limit the growth of a population.

    Density-dependent factors are biotic; density-independent factors are abiotic.
    The most important factor limiting population growth is the scarcest factor in that area.
    If a factor limits population growth, increasing its availability will increase population growth.
    Behaviors with a genetic component can evolve through natural selection.

          

  5. Which of the following could qualify as a top-down control on a grassland community?

    limitation of plant biomass by rainfall amount
    effect of humidity on plant growth rates
    effect of grazing intensity by bison on plant species diversity
    influence of temperature on competition among plants
    influence of soil nutrients on the abundance of grasses versus wildflowers
    olfactory receptor-electromagnetic receptor

          

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