Ecosystem Biodiversity: Species Richness and Evenness
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Questions and Answers

What is a characteristic of areas with high species richness?

  • Environments that are helpful for a large number of species (correct)
  • Ecosystems with low biodiversity
  • Areas with low species evenness
  • Harsh environments that support only a few species

    • What happens to species evenness when relative abundances vary?

  • It becomes infinite
  • It approaches zero (correct)
  • It remains unchanged
  • It increases

    • What can occur in an ecosystem with high species richness?

  • Low species evenness (correct)
  • Only one species can exist
  • No species extinction
  • High species evenness

    • What is the result of extinction of even one species in an ecosystem?

    <p>Countless ripple effects on the entire ecosystem</p> Signup and view all the answers

    What is ecosystem diversity?

    <p>The variety of different habitats, communities, and ecological processes</p> Signup and view all the answers

    What percentage of original natural vegetation must be threatened for an area to be considered a biodiversity hotspot?

    <p>At least 70%</p> Signup and view all the answers

    What is the primary role of plants in food webs?

    <p>Primary producers</p> Signup and view all the answers

    What is a characteristic of a biological community?

    <p>The species that occupy a particular area and the interactions between those species</p> Signup and view all the answers

    What is the significance of biodiversity hotspots in terms of human survival?

    <p>They are crucial for human survival</p> Signup and view all the answers

    Why do animals tend to inhabit areas with high plant diversity?

    <p>Because plants are the base of food webs</p> Signup and view all the answers

    What percentage of the Earth's land surface is represented by biodiversity hotspots?

    <p>Less than 3%</p> Signup and view all the answers

    Why do maps of biodiversity hotspots tend to overlap with maps of natural places that benefit people?

    <p>Because hotspots are among the richest and most important ecosystems in the world</p> Signup and view all the answers

    What is the approximate number of identified species on earth?

    <p>More than 2 million</p> Signup and view all the answers

    What is the primary benefit of biodiversity in terms of resource use?

    <p>Supplying consumptive and productive goods</p> Signup and view all the answers

    What is the estimated percentage of species that have become extinct since the beginning of life on earth?

    <p>99.9%</p> Signup and view all the answers

    What is the primary reason for the importance of preserving biodiversity?

    <p>To ensure human survival in the future</p> Signup and view all the answers

    What are the three levels of diversity?

    <p>Genetic, species, and ecosystem diversity</p> Signup and view all the answers

    What is the approximate number of insects among the identified species?

    <p>~1 million</p> Signup and view all the answers

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