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Level 2 Quiz
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1

To keep tunas and other pelagic fishes on display, public aquarium use big circular tanks. This is because
A)pelagic fishes usually swim in circles.
B)these fishes have no adaptations to avoid solid physical structures, such as walls.
C)the fishes prefer to swim away from viewers.
D)circular tanks provide better hiding place than square ones.
2

Primary production is highest
A)throughout the photic zone.
B)in the photic zone of neritic waters.
C)in the photic zone of oceanic waters.
D)only at the air-water interface.
3

The planktonic animals that divers are likely to see are
A)phytoplankton.
B)megaplankton.
C)macroplankton.
D)meroplankton.
4

Nitrogen-fixing phytoplankton may be
A)Trichodesmium.
B)diatoms.
C)dinoflagellates.
D)Sargassum.
5

Protozoans such as foraminiferans are considered to be zooplankton because
A)they are eukaryotic.
B)they are multicellular.
C)they belong to the Kingdom Animalia.
D)they graze on other types of plankton.
6

Many copepods feed by
A)filter-feeding.
B)creating water currents that draw in cells.
C)using their antennae to strain the water.
D)hopping on top of their prey.
7

Salps and larvaceans
A)are chordates, like the tunicates.
B)are gelatinous medusae.
C)start life as bottom-dwelling larvae.
D)use tentacles to catch prey.
8

Harmful algal blooms can cause all of these problems except
A)release of poisons into the water.
B)harboring bacteria that cause cholera.
C)sore throats and eye irritation.
D)water stratification.
9

The zoea larva of a crab is planktonic, and is an example of
A)meroplankton.
B)holoplankton.
C)picoplankton.
D)phytoplankton.
10

To stay afloat, which of these means is not effective?
A)flat shape
B)storing oil
C)using bubbles
D)streamlining
11

Red muscle is used for
A)providing bursts of power.
B)storing oxygen.
C)storing oils.
D)providing lift.
12

Tunas have all of these features except
A)stiff fins.
B)many scales.
C)a high, narrow tail.
D)finlets.
13

Vertically migrating zooplankton
A)stop migrating if predators are not present.
B)come to the surface by day.
C)rarely live at more than 10 m.
D)feed while at depth, not at the surface.
14

Much of the DOM in the ocean comes from
A)detritus.
B)bacteria.
C)viruses.
D)chlorophyll.
15

One of the shortest known pelagic food chains involves
A)viruses and phytoplankton.
B)phytoplankton and carnivorous copepods.
C)krill and whales.
D)small fishes and tuna.
16

Central gyres do not have high primary productivity because
A)they are murky.
B)they lack nutrients.
C)they are too cold.
D)nutrients only are transported to the surface in winter.
17

In most temperate waters, how many blooms per year are there?
A)one that lasts all year
B)one in summer
C)two: one in spring and one in fall
D)four: one per season
18

Which of these does not apply to areas with upwelling?
A)The water is rich in nutrients.
B)The water is cold.
C)Upwelling occurs year-round.
D)Fishing is good.
19

A beneficial result of an El Niño Event is
A)an increase in upwelling in the southeastern Pacific.
B)lessening of storms.
C)an increase in warm-water fishes.
D)a decrease in diseases such as malaria.





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