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Test your knowledge on Marine Biology by taking this quiz!

1

Why do most scientists think that life started in the oceans?

 

more animals live in water than on land

 

the oldest fossils ever found show this

 

scientists like to scuba dive

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ANSWER: the oldest fossils ever found show this

By studying fossils , scientists know that the earliest life on Earth —probably bacteria—lived in the oceans.

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2

What causes ocean tides?

 

the pull of gravity from the Sun

 

the pull of gravity from the Moon

 

the pull of gravity from the Sun and the Moon

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ANSWER: the pull of gravity from the Sun and the Moon

The pull of gravity from both the Sun and the Moon cause ocean tides. The tides cause the currents that many ocean animals use to travel.

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3

What is an ecosystem?

 

a system that scientists use to organize their field notes

 

a system that animals use to look after their young

 

a community of organisms that depend on each other and their surroundings

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ANSWER: a community of organisms that depend on each other and their surroundings

Ecosystems are made up of communities of organisms that depend on each other and their surroundings. Kelp forests, continental shelves, and mangrove forests are all examples of ocean ecosystems.

Question 3 of 10
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4

Where can you find the greatest diversity of life on Earth?

 

on land

 

in the oceans

 

in your bathroom

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ANSWER: in the oceans

Life in the oceans is much more diverse than life on land; oceans have many more different kinds of organisms.

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5

What is plankton?

 

small, floating animals and algae that live in the ocean

 

pieces of dead wood that float down rivers to the ocean

 

ocean plants that sink in heavy storms

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ANSWER: small, floating animals and algae that live in the ocean

Plankton are small animals ( zooplankton ) and algae ( phytoplankton ) that live in the ocean. They drift on currents and provide food for many ocean residents.

Question 5 of 10
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6

What is the biggest animal that ever lived?

 

King Kong

 

Tyrannosaurus rex

 

the blue whale

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ANSWER: the blue whale

The blue whale is the largest animal that ever lived. An adult can be longer than three school buses stretched end-to-end, and weigh as much as 28 African elephants!

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7

What is bioluminescence?

 

the sunlight that penetrates through the trees in a rain forest

 

glowing lights on animals' bodies

 

the secret ingredient in chocolate chip cookies

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ANSWER: glowing lights on animals' bodies

Bioluminescence makes animals' bodies glow. Chemicals mix together to produce "cold light," which doesn't give off any heat. Some bioluminescent animals get their glow from tiny microbes that live inside light organs in their bodies.

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8

Where can you find 80 percent of all ocean life?

 

in the deep sea

 

in Florida

 

on the continental shelves

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ANSWER: on the continental shelves

Eighty percent of all ocean life is found on the continental shelves . This is because shallow water and the closeness to land provide food, light , and shelter—the conditions needed to support large quantities of life.

Question 8 of 10
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9

Below 2,000 feet, the ocean is...

 

completely frozen over

 

completely dark

 

full of seaweed

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ANSWER: completely dark

When you go below 2,000 feet underwater, no sunlight can penetrate through and you find yourself in total darkness. Fewer animals live in this "twilight zone." Most of their food is provided by sea snow and zooplankton.

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10

The biggest threat to the oceans is...

 

human beings

 

killer whales

 

killer bees

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ANSWER: human beings

We are the biggest threat to the oceans. Over the years we've overfished and polluted the seas. YOU can help change things by becoming an ocean helper

Question 10 of 10
Nice try! Good try! Swimmingly! What a splash! You got out of 10 right on the first guess.