WorksheetsCoral Reefs Chapter 16
Total questions: 20
Worksheet time: 11mins
Name
Class
Date
1.
Reef-building corals are cnidarians that are characterized by:
a)
Having both a polyp and medusa stage
b)
Lacking nematocysts
c)
Having mostly a medusa stage
d)
Having only a polyp stage
2.
Reef-building corals are classified as
a)
Metamorphic
b)
Ametamorphic
c)
Hermatypic
d)
Ahermatypic
3.
Planula is the name given to
a)
Corals that do not build reefs
b)
Coral larvae
c)
The coral skeleton
d)
The coral polyp
4.
Zooxanthellae are essential to reef-building corals because they:
a)
Help in the deposition of the calcium-carbonate skeleton
b)
Provide the coral with protection from predators
c)
Provide the coral with carbon dioxide
d)
Provide the coral with protection from predators
5.
Which of the following is not a source of food and other essential nutrients for corals
a)
Nutrients released by zooxanthellae
b)
Calcium carbonate from shells
c)
Dissolved organic matter (DOM) from the water
d)
Capture of food using mesenterial filaments
6.
Which of the following is not used directly by corals for nutrition
a)
Mesenterial filaments
b)
Photosynthesis
c)
Mucus
d)
Tentacles
7.
Why are reef-building corals limited to shallow waters?
a)
Salinity varies less in shallow water
b)
Calcium carbonate is only available in shallow water
c)
Zooxanthellae need light for photosynthesis
d)
Nutrients concentrate in shallow water
8.
The expulsion of zooxanthellae due to unfavorable conditions is called
a)
Exudation
b)
Bleaching
c)
Decalcification
d)
Denudation
9.
Eutrophication is very detrimental to the development of coral because it increases
a)
The amount of nutrients in the water, hence providing the conditions for the overgrowth of algae
b)
The temperature of the water, which kills the corals
c)
The temperature of the water, which kills the zooxanthellae
d)
The salinity of the water, which kills the corals
10.
Which of the following organisms is least likely to be responsible for bioerosion
a)
Sea urchins
b)
Fish
c)
Clams
d)
Algae
11.
In a typical fringing reef, most of the living coral is found on the:
a)
Reef flat
b)
Coral knolls
c)
Reef crest
d)
Reef slope
12.
Fringing and barrier reefs develop
a)
Along a coast
b)
In the open ocean far from land
c)
Around islands in temperate regions
d)
Near atolls
13.
Generally, an important distinction between barrier and fringing reefs is that barrier reefs
a)
Are found only in the Pacific Ocean
b)
Develop farther away from land
c)
Are found only in the Caribbean
d)
Do not have a reef flat
14.
Atolls actually start as
a)
Reef flats
b)
Fringing reefs
c)
Barrier reefs
d)
Semicircular atolls
15.
In addition to zooxanthellae, what is the other important primary producer in a coral reef?
a)
Turf algae
b)
Benthic diatoms
c)
Coralline algae
d)
Cyanobacteria (blue-green algae)
16.
Primary production is very high in coral reefs but low in surrounding waters. One reason for this is that:
a)
Coralline algae and other algae are very abundant
b)
There is abundant carbon dioxide in coral reefs
c)
Nutrients are efficiently recycled within the reef community
d)
Turf algae release nutrients
17.
Reef corals compete with soft corals for space. Which of the following is a competitive advantage of soft corals?
a)
They produce toxic chemicals
b)
They have special stinging cells
c)
They are able to destroy zooxanthellae of corals.
d)
They are able to dissolve the skeleton of corals.
18.
Giant clams are very large in size because they:
a)
Have zooxanthellae
b)
Filter a large volume of water
c)
Utilize dissolved organic matter from the water
d)
Are parasites when young
19.
Why do we not stop crown-of-thorn outbreaks?
a)
They might be natural
b)
They don’t respond to poison
c)
They have become less common
d)
The crabs will do it
20.
The scientific community is torn on whether reef fish community structures are controlled by pre-settlement processes or that ________.
a)
competitive exclusion is more important
b)
each species has its own niche
c)
there is high competition
d)
larvae are controlled by currents
100 %
