Environmental Science Exam #2

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Historically, the greatest threat to grasslands has been 

Answer:
a)   damage by off-road vehicles.
b)   air pollution.
c)  conversion to farmland.
d)  global climate change.
e)  mineral extraction.
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  • In contrast with the ______________, the soil of the ______________ is more nutrient-rich and this type of biome has fewer insects, parasites, and fungal diseases. Therefore, in many places, these areas are highly endangered. 


    a)temperate grasslands; tropical seasonal forest
    b)tropical rainforest; tropical seasonal forest
    c)tundra; boreal forests
    d)tropical seasonal forest; tropical rainforest
    e)boreal forests; tundra
    b)boreal forests; tundra
  • One biome type that has not been as badly threatened as other biomes is 


    a)arctic tundra.
    b)tropical rainforests.
    c)grasslands.
    d) temperate forests.
    e)southern pine forests.
    a)southern pine forests.
  • We are usually referring to species diversity when we talk about biodiversity. However, genetic diversity is also important to ecological systems because diverse genes 

    a) increase the efficiency and productivity of a system because all niches are filled.
    b)allow an individual organism to adapt to its changing environment.
    c)are necessary for a population to evolve in a changing environment.
    d)lead to diverse ecological processes in a biological community.
    e)are important for a balanced ecosystem.
    c)are important for a balanced ecosystem.
  • Ecological diversity is a measure of the number of 


    a)different kinds of organisms within a community or ecosystem.
    b)different versions of the same gene in an ecological community.
    c)sizes, colors, and shapes of organisms within an ecological community.
    d) niches, trophic levels, and ecological processes of a biological community.
    e)different species in an ecosystem.
    d)different species in an ecosystem.
  • The total number of living species is probably 


    a)about 450,000.
    b)between 500,000 and 1 million.
    c)between 3 million and 50 million.
    d) between 75 and 95 million.
    e)at least 300 million.
    c)at least 300 million.
  • Approximately how many species have been identified on Earth? 


    a)about 500,000
    b)a little less than 1 million
    c) about 1.7 million
    d)a little more than 10 million
    e)about 30 million
    c)about 30 million
  • Most of the species that are yet undiscovered are probably 


    a)mammals and reptiles.
    b)birds and fish.
    c)fungi.
    d)invertebrates.
    e)multicellular plants.
    d)multicellular plants.
  • Species diversity is most concentrated in 


    a)North America and Europe.
    b)South America, Africa, and Southeast Asia.
    c)South Africa, Australia, and Europe.
    d)Oceania, East Asia, and Antarctica.
    e)North America, South America, and Africa
    b)North America, South America, and Africa
  • Habitat fragmentation usually leads to a(n) 


    a)decrease in biodiversity.
    b)reduction in the number of introduced species.
    c) increase in biodiversity due to the isolated populations.
    d)increase in the number of introduced species.
    e) more stable environment.
    a) more stable environment.
  • The most sustainable land use in tropical forests is probably 


    a)logging.
    b)cattle grazing.
    c)monoculture agroforestry.
    d)intensive, efficient modern row cropping.
    e)periodic mixed (swidden or slash-and-burn) agriculture.
    e)periodic mixed (swidden or slash-and-burn) agriculture.
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Free Quiz Question From Environmental Science Exam #2
Question: Historically, the greatest threat to grasslands has been 
Answer:
damage by off-road vehicles.
air pollution.
conversion to farmland.
global climate change.
mineral extraction.