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Level 2 Quiz
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1

Which of these do not have zooxanthellae?
A)black corals
B)gorgonians
C)soft corals
D)fire corals
2

In the polyps of a colony, which parts are not shared among the polyps?
A)skeleton
B)digestive system
C)nervous system
D)tentacles
3

If a coral has no tentacles, it probably
A)has no zooxanthellae.
B)uses mucus to catch zooplankton.
C)uses its mouth to engulf prey.
D)cannot survive long.
4

The ridge at the outer edge of a Pacific reef is made up of
A)branched algae.
B)fire corals.
C)encrusting coralline algae.
D)low-growing corals.
5

Among the most common components of sediment by a reef is
A)shells of clams.
B)dead forams.
C)sponge spicules.
D)remnants of Halimeda.
6

Mass spawning of corals
A)takes place in total darkness.
B)is unpredictable.
C)may involve gametes packaged in bundles.
D)takes place on all reefs.
7

When seawater is too warm, corals may undergo
A)fragmentation.
B)bleaching.
C)extrusion of mesenterial filaments.
D)mucus production.
8

A biologist is alarmed to see that a coral reef is being overgrown by algae. Grazing fishes are abundant in the area. What may be causing the overgrowth?
A)sedimentation from dredging
B)decreased salinity
C)sewage pollution
D)overfishing
9

A diver swims over an area of coral projections and sand channels. This is an example of
A)spur-and-groove formation.
B)a drop-off.
C)a black-reef slope.
D)a reef crest.
10

The fore-reef of an atoll
A)is shallow.
B)has a poorly-developed algal ridge.
C)is nearly vertical.
D)is inhabited by corals all the way to the bottom.
11

A geologist could predict that, over thousands of years, an atoll might form on top of
A)a sand island.
B)a shallow bank.
C)an extinct volcano.
D)a deep-sea rocky ridge.
12

The zooxanthellae of corals may pick up nutrients from
A)fishes.
B)phytoplankton.
C)surface waters.
D)benthic algae.
13

The most aggressive corals are
A)fast-growing.
B)branching.
C)massive.
D)bad-tasting.
14

According to the post-settlement hypothesis of species composition of reef fishes,
A)competition is relatively unimportant.
B)the nature of reef fish communities is determined by the availability of fish larvae.
C)fishes avoid competitive exclusion.
D)for fishes, ecological niches overlap considerably.
15

In areas of reefs where there are lots of sea urchins (Diadema),
A)coralline algae are rare.
B)triton snails have been over-collected.
C)there are dense masts of filamentous algae.
D)seaweed populations tend to remain stable.
16

Common animal symbionts of corals are
A)cyanobacteria.
B)photosynthetic bacteria.
C)crustaceans.
D)parrotfishes.
17

To avoid ciguatera poisoning, don't eat
A)lobsters.
B)barracuda.
C)sardines.
D)shrimp cocktail.
18

Deep-water coral communities tend to accumulate
A)coral fragments.
B)mud.
C)coralline algae.
D)lots of fishes.
19

A no-take reserve will be an effective way to rebuild fish stocks for fishing near the reserve if
A)fish stay in the reserve.
B)fish move in and out of the reserve all the time.
C)the location of the reserve is set by public opinion.
D)juvenile fishes move out of the reserve.





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