About this Study Set
This study set covers Marine Biology through
20 practice questions.
Test your knowledge of the fascinating creatures and environments found in our oceans, designed for elementary school learners. 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
Ocean Wonders: A Marine Biology Quiz study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
Which marine mammal is known for its long, flowing baleen plates instead of teeth?
-
A
Dolphin
-
B
Shark
-
C
Whale
-
D
Seal
2
What are the tiny, colorful animals that build the structures we call coral reefs?
-
A
Jellyfish
-
B
Sea anemones
-
C
Corals
-
D
Sponges
3
Which of these is a type of hard, bony fish with a flat body that lives on the ocean floor?
-
A
Tuna
-
B
Flounder
-
C
Salmon
-
D
Eel
4
What part of a plant helps it stay in place and take in nutrients from the seabed?
-
A
Leaves
-
B
Roots
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C
Stem
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D
Flower
5
Which large, predatory fish has a skeleton made of cartilage instead of bone?
-
A
Cod
-
B
Mackerel
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C
Shark
-
D
Trout
6
What do many small fish do to protect themselves from bigger predators?
-
A
Swim faster
-
B
Hide in seaweed
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C
Travel in schools
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D
Change color
7
Which marine invertebrate has five arms and can regenerate a lost limb?
-
A
Jellyfish
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B
Crab
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C
Starfish
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D
Octopus
8
What is the main food source for many baleen whales?
-
A
Seaweed
-
B
Small fish
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C
Krill
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D
Squid
9
Which marine reptile breathes air and lays its eggs on sandy beaches?
-
A
Dolphin
-
B
Sea turtle
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C
Shark
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D
Penguin
10
What is the largest ocean on Earth?
-
A
Atlantic Ocean
-
B
Indian Ocean
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C
Arctic Ocean
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D
Pacific Ocean
11
Which marine bird is known for its ability to dive deep to catch fish?
-
A
Seagull
-
B
Albatross
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C
Penguin
-
D
Pelican
12
What gas do most marine plants and algae produce that is essential for other ocean life?
-
A
Carbon dioxide
-
B
Oxygen
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C
Nitrogen
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D
Methane
13
Which group of marine animals includes creatures like crabs, lobsters, and shrimp?
-
A
Mollusks
-
B
Echinoderms
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C
Crustaceans
-
D
Fish
14
What is the name for the vast, dark, deep-sea environment where sunlight does not reach?
-
A
Coral reef zone
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B
Intertidal zone
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C
Abyssal zone
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D
Coastal zone
15
Which marine mammal is known for its intelligence and playful behaviour, often seen leaping from the water?
-
A
Seal
-
B
Walrus
-
C
Dolphin
-
D
Whale shark
16
What is the process by which some marine animals can change their colour to blend in with their surroundings?
-
A
Bioluminescence
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B
Migration
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C
Camouflage
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D
Osmosis
17
Which of these is a large, slow-moving marine mammal that eats jellyfish?
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A
Dolphin
-
B
Manatee
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C
Sea otter
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D
Orca
18
What is the name for the part of the ocean where the land meets the sea?
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A
Open ocean
-
B
Deep sea
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C
Coastal area
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D
Pelagic zone
19
Which of these is a soft-bodied marine animal with stinging tentacles?
-
A
Jellyfish
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B
Seahorse
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C
Clam
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D
Urchin
20
What do sea stars primarily eat?
-
A
Plankton
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B
Seaweed
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C
Shellfish
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D
Smaller fish
