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Multiple Choice Quiz
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1

Coastal plain estuaries are far more common on passive margins of continents than on active margins.
A)T
B)F
2

An estuarine salt wedge is formed by a layer of seawater flowing on top of the outflowing freshwater.
A)T
B)F
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)T
B)F
4

Estuary bottoms are usually sandy due to medium-sized sediment particles deposited by both the tide and river.
A)T
B)F
5

Estuarine fishes are unusual in that they are osmoconformers rather than osmoregulators as are most fish.
A)T
B)F
6

Survival of osmoconforming animals is benefited by burrowing in the sediment.
A)T
B)F
7

Many of the fishes of estuaries are juvenile forms that return to the sea in adulthood.
A)T
B)F
8

Suspension feeders are more common in mudflats and deposit feeders more common on sandflats.
A)T
B)F
9

The most common infaunal predators of estuarine mudflats are fishes.
A)T
B)F
10

Bacterial production of hydrogen sulfide would be reduced by elaborate burrows of animals such as a shrimp.
A)T
B)F
11

Shorebirds may specialize on mudflat prey at specific depths due to each bird species' particular shape and length of beak.
A)T
B)F
12

Kelps and other large algae dominate salt-marsh communities on the edges of estuaries.
A)T
B)F
13

Salt-marsh plants typically grow on the fringes of estuaries where their tops are exposed to air even at high tide.
A)T
B)F
14

Much of the detritus used in estuarine communities comes from dead salt-marsh plant remains and the bacteria on them.
A)T
B)F
15

The high density of plants in salt marshes results in food chains dominated by herbivory, with detrital pathways being secondary.
A)T
B)F
16

Mangrove forests can be considered the tropical equivalents of salt marshes.
A)T
B)F
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 the disturbances of changing physical factors, salinity, temperature, 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.





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