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Multiple Choice
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1
Coastal plain estuaries are far more common on passive margins of continents than on active margins.
A)True
B)False
2
An estuarine salt wedge is formed by a layer of seawater flowing on top of the outflowing freshwater.
A)True
B)False
3
In Northern Hemisphere estuaries, marine organisms can penetrate farther upstream on the left side (when facing land) due to the Coriolis effect on water flow.
A)True
B)False
4
Estuary bottoms are usually sandy due to medium-sized sediment particles deposited by both the tide and river.
A)True
B)False
5
Fleshy plants dilute the salts they take up by accumulating large amounts of water.
A)True
B)False
6
Survival of osmoconforming animals is benefited by burrowing in the sediment.
A)True
B)False
7
Many of the fishes of estuaries are juvenile forms that return to the sea in adulthood.
A)True
B)False
8
Suspension feeders are more common in mudflats and deposit feeders are more common on sand flats.
A)True
B)False
9
The most common infaunal predators of estuarine mudflats are fishes.
A)True
B)False
10
Bacterial production of hydrogen sulfide would be reduced by elaborate burrows of animals such as shrimp.
A)True
B)False
11
Shorebirds may specialize on mudflat prey at specific depths due to each bird species' particular shape and length of beak.
A)True
B)False
12
Kelps and other large algae dominate salt-marsh communities on the edges of estuaries.
A)True
B)False
13
Salt-marsh plants typically grow on the fringes of estuaries where their tops are exposed to air even at high tide.
A)True
B)False
14
Fiddler crabs exhibit rhythms of activity patterns and color changes dependent on cycles of the sun and moon.
A)True
B)False
15
Detritus produced in estuarine communities stays within that estuary and does not enter the open ocean or other adjacent communities.
A)True
B)False
16
Mangrove forests can be considered to be the tropical equivalent of salt marshes.
A)True
B)False
17
Estuaries formed by rising sea level invading rivers since the last ice age are called
A)coastal plain estuaries.
B)tectonic estuaries.
C)bar-built estuaries.
D)fjords.
18
The high amounts of nutrients and dead material, and disturbances of changing physical factors such as salinity, temperature, and oxygen in estuaries make them
A)relatively low in productivity and low in number of species.
B)relatively low in productivity and high in number of species.
C)relatively high in productivity and low in number of species.
D)relatively high in productivity and high in number of species.
19
Which of the following features are found among mangroves?
A)salt glands on the leaves
B)pneumatophores
C)prop roots
D)all of the above





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