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Level 1 Quiz
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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

Purse seines can be used to catch
A)cod.
B)salmon.
C)herring.
D)flatfishes.
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

To generate electricity from tidal energy, modern schemes require
A)a means to create a difference in water temperature.
B)pumping nutrient-rich water from the depths.
C)evaporating seawater.
D)constructing barriers across narrow bays.
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 all of these except
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)whether the fish is demersal or pelagic.





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