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WorksheetsArthropods and Mollusks Major Grade
Total questions: 31
Worksheet time: 16mins
Arthropods, like shrimp, have segmented bodies. Check which body parts are present on the shrimp.
visceral mass
abdomen
fins
cephalothorax
What Phylum is the crawfish classified in?
Cephalopoda
Echinodermata
Porifera
Arthropoda
Gastropoda
What type of circulatory system do Arthropods have?
Open circulatory system
Closed circulatory system
Heart with a dorsal blood vessel
Heart with a ventral blood vessel
Heart with both dorsal and ventral blood vessels
Which Mollusk class produces shells with just one opening?
Polyplacophora
Cephalopoda
Crustacea
Gastropoda
Bivalvia
Arthropods, like the crayfish, have segmented bodies. Which is NOT one of those body parts?
visceral mass
abdomen
feet
cephalothorax
Which animal Phylum is the most successful on earth? (80% of all animals are these)
Echinodermata
Porifera
Mollusca
Arthropoda
Crayfish and other arthropods have an open circulatory system with a heart, but no blood vessels.
true
false
The flexible, plastic looking structure in squid that supports it’s shape while swimming.
radula
beak
pen
tentacles
A cephalothorax is the fusing together of these segmented body parts in an Arthropod.
Tail and abdomen
Thorax and abdomen
Head and thorax
Head and abdomen
Squid and crabs are dioecious organisms. What does this mean?
there are two separate sexes (male vs female)
they have a cephalathorax
they are hermaphroditic
they have a complete digestive system
A pill bug has a segmented exoskeleton that allows it to roll into a ball. What Mollusk in the Class Polyplacodermata also has segmented plates that let it roll into a ball to protect itself ?
Cone snail
Oyster
Scallop
Chiton
What organ secretes the shell in animals classified in the Phylum Mollusca?
foot
head
mantle
cephalothorax
What are the freckle-like pigment filled cells on the skin of the squid and the octopus that allow them to change colors and camouflage themselves?
setae
chromatophores
eukaryotes
choanocytes
The Phylum Mollusca is characterized by animals that secrete their own shell. The Cephalopods either do not have a shell or it is internal like in the squid. What does Cephalopoda mean?
stomach foot
many plates
head foot
hatchet foot
The scraping tongue of a snail and an abalone is called a
chromatophore
pharynx
mandible
radula
antennule
What is distinctive about the Class Cephalopoda? Check all that apply
They all have an external shell
They have large heads and soft bodies
They do not have a complete digestive system
Their foot is divided into arms and or tentacles
They have siphons for jet propulsion
Mollusks and Arthropods are only found in this type of environment
marine
freshwater
estuaries
they can be found in all environments
Why do animals in the Phylum Arthropoda molt?
their shells get worn out and should be replaced
they need room to grow
gravity makes the shell too heavy to carry
they must release their eggs and sperm outside the shell
What are the disadvantages to having an exoskeleton like the Arthropods or a shell like the mollusks? Check all that apply
Animals have to eat more food so that they can produce their shells or exoskeletons
They are heavy on land due to gravity, so size is limited
In Arthropods, there is not room for growth so the exoskeleton must be molted
Mollusks are not well protected in their shell
Which organs are highly developed in mollusks like the squid?
eyes
brain
nervous system
all of these
What breathing structures are present in Mollusks like the crawfish and also in Arthropods like the crab?
spiracles
gills
book lungs
Which is true about Mollusks? Check all that apply
dioecious
hermaphroditic
complete digestive system
incomplete digestive system
How many tentacles did the squid have?
8
10
3
2
What cephalopod is considered to be highly intelligent?
squid
nautilus
octopus
cuttlefish
How many invertebrate phylums are there?
2
7
5
4
Which of the following phyla has bilateral symmetry?
porifera
cnidaria and echinodermata
platyhelminthes and annelida
mollusca
arthropods
Which of the following phyla has radial symmetry?
porifera
cnidaria and echinodermata
platyhelminthes and annelida
mollusca
arthropods
Which of the following animals is a gastropod?
snail
oyster
squid
cuttlefish
Which of the following is a bivalvia?
snail
oyster
squid
cuttlefish
Some bivalves like clams are able to dig into the sand. What body part allows the clam to dig?
tongue
foot
visceral mass
cephalothorax
Many bivalves are capable of movement, like the scallop, but a few are sessile. Select all the bivalves that are sessile.
scallop
oyster
clam
mussel
