What is inside a nautilus shell?

Many chambers separated by walls

What is the siphuncle?

A tube that controls gas and liquid in the chambers

How does a nautilus rise and sink?

By changing fluid in its chambers

Why is the nautilus called a living fossil?

Its lineage goes back hundreds of millions of years

Nautilus Shell Quiz: Chambered Spirals and Living Fossils

This nautilus shell quiz descends deep reef slopes with an ancient relative of the octopus. Play an interactive set of 10 questions on shell chambers, the siphuncle, buoyancy control, many suckerless tentacles, pinhole eyes, jet propulsion, nightly migrations, its long lineage, the spiral shape and Jules Verne.

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🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

Group
Which animal group does the nautilus belong to?
Shell
What is inside a nautilus shell?
Tube
What is the siphuncle?
Float
How does a nautilus rise and sink?
Arms
What is special about nautilus tentacles?
Eyes
What kind of eyes does a nautilus have?
Move
How does a nautilus swim?
Night
When does it often rise toward shallower water?
Ancient
Why is the nautilus called a living fossil?
Book
Which Jules Verne submarine shares its name?

Explanations: answer key for all 10 questions

Q1: Which animal group does the nautilus belong to?
Answer: Cephalopods
Octopuses and squid are relatives.
Q2: What is inside a nautilus shell?
Answer: Many chambers separated by walls
The animal lives in the last one.
Q3: What is the siphuncle?
Answer: A tube that controls gas and liquid in the chambers
It helps the nautilus float.
Q4: How does a nautilus rise and sink?
Answer: By changing fluid in its chambers
It is like a submarine.
Q5: What is special about nautilus tentacles?
Answer: They have no suckers
Ridges help them grip.
Q6: What kind of eyes does a nautilus have?
Answer: Pinhole eyes without lenses
Water flows into them.
Q7: How does a nautilus swim?
Answer: By jet propulsion
It pushes water through a funnel.
Q8: When does it often rise toward shallower water?
Answer: At night
It returns deep by day.
Q9: Why is the nautilus called a living fossil?
Answer: Its lineage goes back hundreds of millions of years
Its shell form has changed little.
Q10: Which Jules Verne submarine shares its name?
Answer: The Nautilus
Captain Nemo commanded it.

Nautilus Shell Quiz – Chambered Spirals and Living Fossils

The chambered nautilus is a cephalopod, related to octopuses and squid, living on deep reef slopes in the Indo-Pacific. It carries a coiled shell divided into many chambers, living only in the newest one.

A tube called the siphuncle adjusts gas and liquid in the older chambers, letting the nautilus rise and sink. It swims by jet propulsion and often moves toward shallower water at night.

It has many tentacles without suckers and simple pinhole eyes. Its lineage reaches back hundreds of millions of years, and Jules Verne named Captain Nemo's submarine after it.

What This Quiz Teaches

Ocean fans will enjoy these questions.

What a nautilus is
How its shell works
How it moves
What its eyes are like
Why it is ancient

Did You Know?

Its spiral is often said to follow the golden ratio, but it usually does not.
Nautiluses can live for 20 years or more.
Shell collecting has reduced some populations.
International trade in nautilus shells is now controlled.
It smells food from a distance in dark water.