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The salinity in salt marshes can vary throughout the day because _______.
a. river flow changes throughout the day
b. the amount of salt water in a marsh depends upon ocean tides
c. daily winds and rains result in salt and fresh water mixing
d. salt water collects in the lowest elevations
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b. the amount of salt water in a marsh depends upon ocean tides
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Salt marshes are found _______.
a. at high elevations
b. away from the coast
c. on high energy coastlines
d. on low energy coastlines
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d. on low energy coastlines
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The traditional view of mangrove forests as wastelands and unhealthy environments helped promote their degradation because _______.
a. mangrove forests are unproductive, unhealthy habitats
b. people did not feel it was necessary to preserve them
c. mangrove forests do not need to be preserved
d. all of the above
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b. people did not feel it was necessary to preserve them
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Mangrove have two types of specialized root systems.
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True
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How has human use of salt marshes changed over time?
a. Humans have come to value salt marshes and now seek to preserve and restore them.
b. Humans now use drained salt marshes exclusively for agriculture.
c. Humans have begun to use salt marshes for landfills.
d. Humans have begun to use marsh land for housing and commercial development.
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a. Humans have come to value salt marshes and now seek to preserve and restore them.
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Mangrove pneumatophore roots _______.
a. prop the trees up above the water line
b. excrete excess salt
c. absorb carbon dioxide from the air
d. none of the above
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c. absorb carbon dioxide from the air
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Mangrove forests were traditionally viewed as unhealthy, unproductive environments.
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True
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Which of the following is not true concerning salt marshes?
a. Historically they were drained for agriculture.
b. Historically they were drained for development.
c. Salt marshes are not productive habitats.
d. Remaining marshes are severely degraded.
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c. Salt marshes are not productive habitats.
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Why do many fishermen support efforts to protect and restore mangrove forests?
a. Most fishermen are environmentalists.
b. Many fish breed in mangrove forests.
c. They lay their nets in mangrove forests.
d. Mangrove forests provide valuable hardwoods.
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b. Many fish breed in mangrove forests.
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Mangrove forests help mitigate storm damage.
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True
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