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Cephalopods

Total questions: 32

Worksheet time: 20mins

Name
Class
Date
1.

The pigment cells in many cephalopods that help with camouflage pictured here are called

a)

odontophores

b)

chromatophores

c)

photophores

d)

melanocytes

2.
The part of the cephalopod body that helps with propulsion through the water is the
a)
jet
b)
siphon
c)
pen
d)
mantle
3.

Ancestral cephalopods are called

a)

ammonites

b)

brachiopods

c)

sarcopterygii

d)

helcionellids

4.
This cephalopod is a member of 
a)
Superorder Decapodiformes
b)
Superorder Octopodiformes
c)
Subclass Nautiloidea
d)
Class Polyplacophora
5.

The nautilus has a shell that primarily functions in

a)

protection

b)

buoyancy

c)

egg storage

d)

camouflage

6.
Among mollusks, which is a special characteristic of cephalopods?
a)
an open circulatory system.
b)
a two way digestive system.
c)
the only mollusk class with gills.
d)
a closed circulatory system.
7.
The modified arm of male cephalopods that is used for reproduction is called the
a)
spermatophore
b)
hectocotylus
c)
crop
d)
chromatophore
8.
Which group of cephalopods can have barbed / clawed tentacles? 
a)
Cuttlefish
b)
Nautilus
c)
Squid
d)
Octopuses
9.
Which group of cephalopods has ability to flatten body to fit in small spaces and change skin to blend with surroundings?
a)
Cuttlefish
b)
Nautilus
c)
Squid
d)
Octopuses
10.
The similarity between the vertebrate and cephalopod eye is a great example of 
a)
convergent evolution
b)
divergent evolution
c)
macroevolution
d)
speciation
11.

Which group of cephalopods has a pen / gladius and what is it composed of? 

a)

Cuttlefish - calcium carbonate

b)

Cuttlefish - chitin

c)

Squid - Chitin

d)

Squid - calcium carbonate

12.

How many hearts do cephalopods have? 

a)

1

b)

2

c)

3

d)

4

13.

The main difference between the two superorders Octopodiformes & Decapodiformes is

a)
number of eyes
b)
number of arms
c)
presence or absence of shell
d)
presence of absence of fins
14.

Argonauts are octopods that produce a shell for

a)

egg storage (only females make shells)

b)

protection

c)

buoyancy

d)

spermatophore storage (only males make shells)

15.

Cells that reflect an iridescent shine in many cephalopods are called

a)

chromatophores

b)

photophores

c)

iridophores

d)

nacreophores

16.

Most cephalopods rely on their excellent vision to find prey, escape, and camouflage. This group has primitive eyes and poor eyesight compared its cephalopod cousins:

a)

Cuttlefish

b)

Squid

c)

Nautiluses

d)

Octopuses

e)

Argonauts

17.

Structure G is the

a)

siphon

b)

buccal mass

c)

gonad

d)

gladius

18.

Structure I is the

a)

ink gland

b)

ctenidia / gill

c)

branchial heart

d)

systemic heart

19.

Structure J is the

a)

ink gland

b)

ctenidia / gill

c)

branchial hearts

d)

systemic heart

20.

Structure F is the

a)

beak

b)

buccal mass

c)

branchial hearts

d)

tentacles

21.

Structure C is the

a)

fins

b)

siphon

c)

feeding tentacles

d)

arms

22.

The California Market Squid (Loligo opalescens) is commercially fished through a process called

a)

seining

b)

trawling

c)

netting

d)

hooking

23.

Which traits make most cephalopods active predators?

a)

closed circulatory system = increased energy efficiency

b)

superior eyesight & intelligence

c)

siphon & streamlined body for jet propulsion / speed

d)

camouflage, mimicry, crypsis

e)

grasping foot of tentacles for grabbing prey

24.

In addition to tactile (touch) sense in the suckers, cephalopods can also _____ with their arms.

a)

smell

b)

see

c)

taste

d)

hear

25.

Animals that mate several times over their lives are ​ (a)   and those that mate only once during their lifetime are ​ (b)  

Choose from the below words
iteroparous
semelparous
26.

The tube that adds air into the septa of a nautilus' shell is called a

a)

radula

b)

spermatophore

c)

visceral mass

d)

siphuncle

e)

pseudomorph

27.

The hair-like structures on the suckers of cirrina octopuses are called

a)

cirri

b)

setae

c)

bristles

d)

siphuncles

28.

The sex of this squid is

a)

male

b)

female

c)

can't tell

29.

The sex of this squid is

a)

male

b)

female

c)

can't tell

30.

Match the following photos to the correct order:

a)

1.

Order Sepiida

b)

2.

Order Teuthida

c)

3.

Order Incirrina

d)

4.

Order Cirrina

e)

5.

Order Sepiolida

31.

Match the following cell type to definition:

a)

Cells that reflect light

1.

Iridophores

b)

Cells that produce light

2.

Photophores

c)

Cells that contain pigment and change color

3.

Chromatophores

32.

Squid swim in social groups called

a)

swarms

b)

squads

c)

shoals

d)

strings

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