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Ocean Quiz for Kids: 12 Questions About the Sea
Dive in! This ocean quiz has 12 easy questions about whales, sharks, octopuses, coral reefs and the sea itself.
Each answer comes with a fun fact about life under the waves.
Play the quiz
Pick A, B or C for each question. The right answer turns green and a short fact explains it.
All 12 questions and answers
Every question with its answer and explanation. Open “Show answer” after you guess.
1 What is the biggest animal in the ocean?
- A The blue whale
- B The giant squid
- C The great white shark
Show answer
✓ Answer: A. The blue whale
Did you know? A blue whale is longer than a basketball court is wide, and its heart is as big as a small car.
2 How many arms does an octopus have?
- A Six
- B Eight
- C Ten
Show answer
✓ Answer: B. Eight
Did you know? An octopus also has three hearts and blue blood.
3 Why is sea water salty?
- A Salt from rocks is washed into the sea by rivers
- B Fish add salt
- C Rain is salty
Show answer
✓ Answer: A. Salt from rocks is washed into the sea by rivers
Did you know? Rivers carry tiny bits of salt from rocks into the ocean, and it stays there.
4 What is 'Nemo' from Finding Nemo?
- A A goldfish
- B A clownfish
- C A tuna
Show answer
✓ Answer: B. A clownfish
Did you know? Real clownfish live among the stinging arms of sea anemones, which protect them.
5 Are dolphins fish or mammals?
- A Mammals
- B Fish
- C Reptiles
Show answer
✓ Answer: A. Mammals
Did you know? Dolphins breathe air through a blowhole and feed their babies milk.
6 What is a coral reef made by?
- A Tiny animals called coral polyps
- B Seaweed
- C Sand castles
Show answer
✓ Answer: A. Tiny animals called coral polyps
Did you know? Coral reefs are home to about a quarter of all ocean life.
7 Which sea animal has a hard shell and can live more than 50 years?
- A A starfish
- B A jellyfish
- C A sea turtle
Show answer
✓ Answer: C. A sea turtle
Did you know? Some sea turtles swim thousands of miles to lay eggs on the beach where they were born.
8 How do fish breathe underwater?
- A With lungs
- B With gills
- C Through their tails
Show answer
✓ Answer: B. With gills
Did you know? Gills take oxygen out of the water.
9 What pulls the ocean to make tides?
- A The wind
- B Whales
- C The Moon
Show answer
✓ Answer: C. The Moon
Did you know? The Moon's gravity pulls on the ocean, making the water rise and fall each day.
10 Which animal has no brain, no heart and no bones?
- A A seal
- B A crab
- C A jellyfish
Show answer
✓ Answer: C. A jellyfish
Did you know? Jellyfish have been drifting in the ocean for hundreds of millions of years.
11 What does a starfish have that can grow back if it is lost?
- A Its arms
- B Its shell
- C Its fins
Show answer
✓ Answer: A. Its arms
Did you know? Scientists now often call starfish 'sea stars' because they are not fish.
12 Which ocean animal uses ink to escape?
- A The whale
- B The octopus
- C The seahorse
Show answer
✓ Answer: B. The octopus
Did you know? A cloud of ink hides the octopus while it swims away.
For parents and teachers
Every question has three answers to choose from and a short, simple explanation, so children learn something even when they guess wrong. Reading the explanation out loud and asking 'did you know that?' turns the quiz into a conversation. Leave 'Timed mode' switched off for younger players.
Ocean fans can go on to our Shark Quiz, Sea Otter Quiz and octopus hearts page.
Ocean Quiz for Kids FAQ
What age is this quiz for?
It is written for children aged about 6 to 12. Younger kids can play with a parent reading the questions aloud.
Is it safe and free for kids?
Yes. The quiz is free, needs no account and does not ask for any personal information.
Can teachers use it in class?
Yes. Put it on a classroom screen and let the class vote on each answer. Every answer has a short explanation about the ocean to talk about together.