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Mollusks Test 2026

Total questions: 40

Worksheet time: 38mins

Name
Class
Date
1.

Match the following.

a)

Mollusca

1.

mollusks

b)

Gastropoda

2.

snails and nudibranchs

c)

Bivalvia

3.

clams, oysters, muscles, scallops

d)

Cephalopoda

4.

squid, octopuses, cuttlefish, nautillus

2.

Bivalves have a laterally compressed body with a hinged, two-piece shell and large gills.

a)

False

b)

True

3.

Gastropods have a coiled up group of organs surrounded by a shell and a crawling foot located on it's ventral side.

a)

True

b)

False

4.

Which class of mollusks is made-up of carnivorous predators with sucker-like tentacles, well-developed sense organs, and relatively large brains?

a)

Gastropoda

b)

Bivalvia

c)

Cephalopoda

5.
I have a soft-body, a hard shell, and live on land and water.  What am I?
a)
Mollusk
b)
Arthropod
c)
Echinoderm
d)
Cnidarian
6.
What is the radula used for?
a)
Locomotion
b)
Feeding
c)
Swimming
d)
Digging
7.

What TYPE of mollusk is this?

a)

Bivalve

b)

Gastropod

c)

Cephalopod

8.
What does Cephalopod mean?
a)
means "2-shells"
b)
means "head-foot"
c)
means "stomach-foot"
9.
Which part of the Mollusk body is specialized for burrowing, feeding, and movement?
a)
trochophores
b)
visceral mass
c)
mantle
d)
foot
10.

The pearl oyster is a

a)

bivalve

b)

gastropod

c)

cephalopod

d)

planarian

11.

This highly venomous cone snail lives of course, where?

a)

Asia

b)

Australia

c)

United states

d)

Africa

12.

Which of the following is a cephalopod?

a)

mimic octopus

b)

cone snail

c)

pearl oyster

d)

yellow planarian

13.

Which of the following BEST describes a cephalopod?

a)

large external shell

b)

single foot

c)

beaked mouth

d)

feed on algae

14.
Gastropoda, Bivalva, Cephalapoda are all classes within the Phylum _______. 
a)
Arthropoda
b)
Mollusca
c)
Porifera 
d)
Cnidaria
15.
Bivalves don't have radula because they_____. 
a)
have two shells
b)
use gills instead
c)
are filter feeders
d)
don't eat meat
16.

This is a

a)

blue dragon nudibranch

b)

man o war

c)

blue sponge

17.
Staying in one place and not moving 
a)
Sessile
b)
Radula
c)
Mantle
d)
Bivalve
18.

Bivalves literally mean what?

a)

having bright blue eyes

b)

having 2 shells held together by tough ligaments

c)

having bilateral symmetry

d)

scallop

19.

The shell of bivalves (as in coral too) is made of what chemical compound?

Calcium carbonate

a)

CO2

b)

Ca

c)

CO

d)

CaCO3

20.

All the below are cephalopod traits but which is MOST important!

a)

they have a parrot-like beak

b)

they are masters of camouflage

c)

they are among the most intelligent of all invertebrates and even some vertebrates

d)

they have jet propulsion

21.

When you lick a slug it

a)

kills you

b)

makes your mouth and tongue go numb

c)

makes you hallucinate

d)

turns you into a zombie :p

22.

This deadly blue ringed octopus is found in

a)

India

b)

North America

c)

Australia

d)

Jamaica

23.

The hard part of the mouth in squid and octopuses is called the

a)
Beak
b)
Radula
c)
Tentacle
d)
Arm
24.
Which class of Mollusks have many species that are sessile?
a)
Gastropods
b)
Bivalves
c)
Cephalopods
25.

The sea bunny is a species of

a)

nudibranch

b)

flatworm

c)

jellyfish

d)

coral

26.

Nudibranchs like this species are so brightly colored because

a)

it camouflages them

b)

they are poisonous

c)

they attract mates

27.

How do octopuses show emotions?

a)

They change into a rock.

b)

They swim around their homes.

c)

They move their tentacles.

d)

They change their colors.

28.

Which mollusk group is “stomach footed”?

a)

Gastropod

b)

Bi-valve

c)

Cephalopod

29.

What are the 3 basic body parts of a

mollusk?

a)

head, tail, shell

b)

head, foot, mantle

c)

Head, foot, tentacles

30.

?

a)

nautalis

b)

cuttlefish

c)

tiger octopus

31.

Who is this?

a)

giant squid

b)

giant octopus

c)

blanket octopus

d)

pygmy octopus

32.

?

a)

dumbo octopus

b)

Caribbean reef octopus

c)

glass octopus

33.

The reason why this tiny and beautiful flamboyant cuttlefish is so pretty and brightly colored is

a)

camouflaged

b)

its toxic

c)

to attract mates

34.

Smallest octopus is the

a)

blue ringed

b)

hairy

c)

star sucker pygmy

d)

giant

35.

Who lives entire life far out at sea in open water?

a)

blanket octopus

b)

giant octopus

c)

mimic octopus

d)

giant squid

36.

Whos this?

a)

pygmy ocotopus

b)

glass ocotopus

c)

blanket octopus

37.

?

a)

werewolf octopus

b)

star sucker pygmy octopus

c)

hairy octopus

38.

? (HINT: Has skin texture of the rock and plants it is on)

a)

Atlantic pygmy

b)

Caribbean reef

c)

dumbo

d)

giant

39.

Who poses as up to 15 other animals?

a)

coconut

b)

glass

c)

mimic

d)

dumbo

40.

Species?

a)

flying squid

b)

vampire squid

c)

piglet squid

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