About this Study Set
This study set covers Oceanography through
20 practice questions.
A comprehensive quiz on marine biology, physical oceanography, and environmental processes. Every question includes the correct answer so you can learn as you go — pick any format above to get started.
Questions & Answers
Browse all 20 questions from the
Oceanography: Marine Life and Ecosystems study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
Which marine mammal is known to be the deepest diver, capable of reaching depths of over 2,000 meters?
-
A
Sperm whale
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B
Bottlenose dolphin
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C
Blue whale
-
D
California sea lion
2
What is the primary substance that makes up the skeletal structures of reef-building corals?
-
A
Calcium carbonate
-
B
Silica
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C
Magnesium sulfate
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D
Iron oxide
3
Which zone of the ocean is defined by the complete absence of sunlight?
-
A
Aphotic zone
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B
Photic zone
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C
Intertidal zone
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D
Pelagic zone
4
What phenomenon causes the upwelling of nutrient-rich cold water along coastlines?
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A
Ekman transport
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B
Tidal resonance
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C
Coriolis effect
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D
Thermal expansion
5
Which type of phytoplankton is responsible for a large portion of the Earth's oxygen production through photosynthesis?
-
A
Prochlorococcus
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B
Dinoflagellates
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C
Coccolithophores
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D
Brown algae
6
What is the largest marine protected area in the world by surface area?
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A
Papahānaumokuākea Marine National Monument
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B
Great Barrier Reef Marine Park
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C
Ross Sea Region Marine Protected Area
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D
Galápagos Marine Reserve
7
Which sea creature possesses three hearts and blue blood?
-
A
Octopus
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B
Giant squid
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C
Cuttlefish
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D
Nautilus
8
What is the salinity of typical open ocean water?
-
A
35 parts per thousand
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B
10 parts per thousand
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C
50 parts per thousand
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D
5 parts per thousand
9
Which ocean current is a major contributor to the relatively mild climate of Western Europe?
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A
Gulf Stream
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B
California Current
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C
Labrador Current
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D
Peru Current
10
What type of fish is uniquely known for its ability to live in both freshwater and saltwater environments throughout its life cycle?
-
A
Euryhaline fish
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B
Stenohaline fish
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C
Benthic fish
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D
Pelagic fish
11
What is the name of the process by which atmospheric carbon dioxide is sequestered in the deep ocean?
-
A
Biological pump
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B
Carbon sink reversal
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C
Oceanic degassing
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D
Thermal stratification
12
Which gas, released during the decay of organic matter on the seafloor, is associated with methane clathrates?
-
A
Methane
-
B
Nitrogen
-
C
Helium
-
D
Neon
13
What is the largest species of shark currently inhabiting the Earth's oceans?
-
A
Whale shark
-
B
Great white shark
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C
Basking shark
-
D
Hammerhead shark
14
Which organism is the primary producer at the base of the Antarctic marine food web?
-
A
Antarctic krill
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B
Diatoms
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C
Copepods
-
D
Icefish
15
What term describes the sharp change in density with depth in the ocean?
-
A
Pycnocline
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B
Thermocline
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C
Halocline
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D
Bathycline
16
Which marine reptile spends its entire life cycle in the ocean and is known for traveling thousands of miles to nesting beaches?
-
A
Leatherback sea turtle
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B
Saltwater crocodile
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C
Marine iguana
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D
Sea snake
17
What is the primary cause of ocean acidification?
-
A
Absorption of atmospheric CO2
-
B
Volcanic activity
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C
Increased solar radiation
-
D
Agricultural runoff
18
Which layer of the ocean contains the highest concentration of marine life?
-
A
Epipelagic zone
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B
Mesopelagic zone
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C
Bathypelagic zone
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D
Abyssopelagic zone
19
What is the average depth of the world's oceans?
-
A
3,700 meters
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B
1,200 meters
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C
5,500 meters
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D
2,000 meters
20
Which organism exhibits bioluminescence to attract prey in the bathypelagic zone?
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A
Anglerfish
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B
Sea star
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C
Sea urchin
-
D
Giant clam
