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Multiple Choice
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1
Food from the sea represents nearly half of all food eaten by humans.
A)True
B)False
2
Most of the world's fishing people are employed in high-tech fishing fleets.
A)True
B)False
3
Much of the clupeoid catch of the world is not eaten directly but rather converted into fish meal for use as animal feed.
A)True
B)False
4
Cods of the Grand and Georges Banks off eastern Canada and the northeastern United States once provided one of the richest fisheries in the world but now are nearly gone.
A)True
B)False
5
Purseseines are nets used to surround and trap large schools of fishes.
A)True
B)False
6
The maximum sustainable yield for a fishery usually occurs when the harvested species population is at its highest possible level.
A)True
B)False
7
Recent studies have shown that around 90% of the original stocks of large-size marine fishes remain.
A)True
B)False
8
The term by-catch refers to currently underutilized species of marine animals caught when valuable species of animals are caught.
A)True
B)False
9
Peru is one of the top fisheries countries because the Peruvian anchovy fisheries have been well managed since the 1950s.
A)True
B)False
10
Unlike most harvested marine animals, the large numbers of krill around Antarctica are continuing to provide an increasing harvest each year.
A)True
B)False
11
Open mariculture refers to the practice of raising marine organisms in enclosures that are open to more-or-less natural conditions.
A)True
B)False
12
Salmon ranching relies on the ability of salmon to return to the site where they were hatched after maturing at sea.
A)True
B)False
13
Medically useful compounds are being found in soft, immobile marine animals because these animals often defend themselves with noxious biochemicals.
A)True
B)False
14
Manganese nodules are mounds of minerals created at the hydrothermal vents when hot water encounters cold seawater, triggering mineral precipitation.
A)True
B)False
15
Manganese nodules on the seafloor may be economically useful because they contain not only manganese but other metals such as copper and cobalt.
A)True
B)False
16
Evaporation of seawater to concentrate its minerals has been a technique used for centuries to obtain NaCl.
A)True
B)False
17
Construction of devices to capture the renewable energy of the tides has no significant negative effects on the environment.
A)True
B)False
18
Ocean thermal energy conversion is a technique that works best if the surface waters are much warmer than deeper waters, such as where there is a strong thermocline.
A)True
B)False
19
The most important group of demersal fish caught for human use are the
A)clupeoids.
B)tunas and relatives.
C)salmon.
D)cods and relatives.
20
The maximum sustainable yield of a harvested fish population depends on
A)the size and age of fish caught.
B)the reproductive and growth rates and lifespans of the fish.
C)interactions with competing species.
D)all of the above
E)both a and b





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