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5 Written questions

5 Matching questions

  1. 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.
  2. Sensory pathways have four basic functions: sensory reception, transduction, transmission, and perception. How do these functions differ between yourself and a star-nosed mole?
    Select all that apply.
    Select all that apply.
    The perception of sensory input by humans and star-nosed moles differs.
    The mechanism by which the energy of a sensory stimulus is transduced into a receptor potential differs between humans and star-nosed moles.
    The number and type of sensory receptors in humans and star-nosed moles differ.
  3. Graylag goslings imprint on a nearby object that moves away from them during a sensitive period in the first few hours after they hatch, and follow the object steadfastly from that time on. What is the adaptive value of this behavior?

    This behavior is not adaptive because goslings may imprint on objects other than their parents.
    This behavior is likely to increase gosling survival.
    This behavior is genetic.
  4. Which statement about dispersal is false?

    Dispersal occurs only on an evolutionary time scale.
    Colonization of devastated areas after floods or volcanic eruptions depends on dispersal.
    Seeds are important dispersal stages in the life cycles of most flowering plants.
    Dispersal is a common component of the life cycles of plants and animals.
    The ability to disperse can expand the geographic distribution of a species.
  5. In ecological terms, disturbance is an event such as a storm, fire, or human activity that changes a community, removing organisms and altering resource availability. Which of the following statements about the effects of disturbance is correct?

    A healthy community is in an equilibrium state of balance, with few disturbances.
    The effects of disturbance on a community are almost always negative.
    Disturbances can create patches of different habitats in a community.
  1. a The intercalated disks allow coordinated contraction of the whole heart.
  2. b 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. c Dispersal occurs only on an evolutionary time scale.
  4. d Disturbances can create patches of different habitats in a community.
  5. e This behavior is likely to increase gosling survival.

5 Multiple choice questions

  1. tropical rain forest
  2. Patches of different habitats within the landscape
  3. multiple biotic and abiotic factors contribute to the cycling of the hare and lynx populations
  4. Sea urchins have a much greater effect than limpets in limiting seaweed cover.
  5. Calcium levels remained high in the soil of deforested areas.

5 True/False questions

  1. The discipline that applies ecological principles to returning degraded ecosystems to a more natural state is known as

    conservation ecology.
    population viability analysis.
    restoration ecology.
    resource conservation.
    landscape ecology.
    the members of the population are competing for access to a resource.

          

  2. Nitrifying bacteria participate in the nitrogen cycle mainly by

    incorporating nitrogen into amino acids and organic compounds.
    converting ammonia to nitrogen gas, which returns to the atmosphere.
    converting nitrogen gas to ammonia.
    converting ammonium to nitrate, which plants absorb.
    releasing ammonium from organic compounds, thus returning it to the soil.
    converting ammonium to nitrate, which plants absorb.

          

  3. Select the correct statement describing the nitrogen cycle.

    Nitrogen-fixing microbes provide energy for carbon fixation.
    Denitrifying bacteria reduce ammonia (NH3 +) to molecular nitrogen (N2).
    Bacteria obtain energy from nitrification.
    Bacteria obtain energy from nitrification.

          

  4. Female spotted sandpipers aggressively court males and, after mating, leave the clutch of young for the male to incubate. This sequence may be repeated several times with different males until no available males remain, forcing the female to incubate her last clutch. Which of the following terms best describes this behavior?

    promiscuity
    certainty of paternity
    monogamy
    polyandry
    polygyny
    polyandry

          

  5. 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.
    A population with a positive value of r will grow exponentially.