Environmental Science Quiz: Toxins and Trophic Levels
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Questions and Answers

What can contribute to the rapid spread of introduced species in a new location?

  • Presence of predators or pathogens (correct)
  • Harvesting above sustainable levels
  • Competition with native organisms
  • High reproductive rates of native populations
  • Which type of habitat is most at risk from overharvesting?

  • Large forested areas
  • Grasslands
  • Mountainous regions
  • Small islands (correct)
  • What is the primary reason for increased overharvesting of species?

  • Decrease in human demand
  • Decrease in species' reproductive rates
  • Increase in human demand (correct)
  • Decrease in technological advances
  • What type of pollutants can cause harm by bioaccumulating in animals?

    <p>Metals like mercury and lead</p> Signup and view all the answers

    Which factor makes large organisms more vulnerable to overharvesting?

    <p>Low reproductive rates</p> Signup and view all the answers

    Why are synthetic chemicals like pesticides harmful to predatory birds?

    <p>Cause thinning of eggshells</p> Signup and view all the answers

    What is species diversity primarily measured by?

    <p>Abundance of species in an ecosystem</p> Signup and view all the answers

    Why is global extinction of a species less influential on a local level compared to local extinction?

    <p>Local extinction affects ecosystem stability more than global extinction.</p> Signup and view all the answers

    What does ecosystem diversity encompass in addition to communities?

    <p>Non-living environments</p> Signup and view all the answers

    Which of the following is a major threat to biodiversity alongside introduced species and overharvesting?

    <p>Climate change</p> Signup and view all the answers

    Which activity contributes directly to habitat loss as one of the threats to biodiversity?

    <p>Urbanization</p> Signup and view all the answers

    How does introduced species impact biodiversity differently from overharvesting?

    <p>Introduced species directly reduce habitat quality, while overharvesting depletes species populations.</p> Signup and view all the answers

    What happens to toxins like DDT as they move up successive trophic levels in a food web?

    <p>They become more concentrated</p> Signup and view all the answers

    Which activity is likely to result in the creation of 'dead zones' in bodies of water?

    <p>Fertilizer run-off from farms</p> Signup and view all the answers

    How did Rachel Carson contribute to the environmental movement?

    <p>By raising awareness of the dangers of DDT</p> Signup and view all the answers

    What is one of the ways biodiversity helps ecosystems?

    <p>Purifies water</p> Signup and view all the answers

    In Conservation Biology, why is establishing protected areas critical for preserving biodiversity?

    <p>To prevent global extinction</p> Signup and view all the answers

    What action can lead to the collapse of bee populations, as mentioned in the text?

    <p>Run-off from farm fertilizers</p> Signup and view all the answers

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