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WorksheetsMarine Bio Q3 Midterm 2025
Total questions: 45
Worksheet time: 41mins
What are these organisms?
Sea anemone
Sea star
Sea sponge
Sea urchin
Arthropods undergo a process of shedding their exoskeleton in order to grow. This is known as
molting
chitin
mimicry
bioluminescence
How would you classify a sea jelly?
cnidarian - ctenophore
cnidarian - medusa
cnidarian - poly
cnidarian - cnidocyte
Classification system (starting from the largest group)
phylum, kingdom, class, order, family, genus, species
kingdom, class, phylum, order, family, genus, species
kingdom, phylum, class, order, family, genus, species
kingdom, phylum, class, family, order, genus, species
Cephalopods swim and move around via (a) .
Identify the phylum containing organisms with the following characteristics:
1. Organisms are strictly aquatic
2. Organisms have radial symmetry
3. There are two body plans: polyp and medusa
(a)
Identify the phylum containing organisms with the following characteristics:
1. Bilateral symmetry
2. Usually covered by shell made of calcium carbonate
3. 4 classes include: chiton, gastropods, bivalves, cephalopods
(a)
This bivalve is able to filter at least 50 gallons of water in a day!
sponge
clam
oyster
horseshoe crab
Animals share all of the following characteristics except
they are multicellular
they are autotrophs
they are consumers
they are able to move or were able to move at some point during their life cycle
Adaptations that allow octopods to evade or escape predators include: SELECT ALL THAT APPLY
they can create ink screens
they are capable of releasing a harpoon containing toxic chemicals
they can change the texture of their skin
they are gelatinous (made up of mostly water)
By-the-wind sailors (pictured) are closely related to Portuguese man-of-war and are commonly found along California beaches after a high tide. What is the correct classification for these organisms?
Kingdom Animalia, Phylum Mollusca, Class Bivalvia
Kingdom Animalia, Phylum Mollusca, Class Cephalopoda
Kingdom Archaea, Phylum Porifera, Class Chiton
Kingdom Animalia, Phylum Cnidaria, Class Hydrozoa
This animal exhibits...
Bilateral Symmetry
Radial Symmetry
No Symmetry
Which phylum does this crab belong to?
Porifera
Cnidaria
Platyhelminthes
Arthropoda
Bivalve
Gastropod
Cephalopod
None of the above
Check all of the marine animals below that are classified as arthropods.
corals
crabs
octopuses
oyster
shrimp
Arthropods have an exoskeleton that provides support and protects their soft internal organs.
True
False
Molting is the process in which an arthropod sheds its exoskeleton to make room for a new, larger one.
True
False
What type of circulatory system do crustaceans have?
Open
Closed
None
What does a crustacean do to grow larger?
Attach itself to substrates
Reproduce
Molt
Use jointed appendages
A very important crustacean that filter-feeding whales consume:
Copepod
Barnacle
Krill
Hermit crab
Crustaceans with 10 legs:
Copepods
Decapods
Arthropods
Maxilipods
How do crustaceans breathe?
Through their siphon
With their gills
With their maxillipeds
With their swimmerets
The only type of crustacean that attaches to a substrate and relies on water currents for capturing food
copepod
brine shrimp
barnacle
hermit crab
Another name for the pincers/ claws are
swimmeretts
thorax
chelipeds
mandibles
What term describes a life cycle that alternates between two forms, such as the medusa and polyp?
generational life cycle
alternation of life cycle
alternation of generations
changing life forms
What term describes the 2 name naming system for organisms?
dichotmous key
binomial nomenclature
2 scientific names
binomial key
What do all invertebrates have in common?
A brain
No backbone
Blue-colored blood
Many legs
What features do a clam, sea slug, and squid share in common? (select all right answers)
They are all in the "Mollusca" Group
They all have a brain
They all have gills
The all have a mantle
Which animal has eyes most like our own?
Seastar
Shrimp
Octopus
What is a marine sponge?
Plant
Animal
Mineral
What type of animal is a barnacle?
Arthropod (shrimp, crabs, bugs)
Mollusc (squid, clams, slugs)
Echinoderm (seastars)
Cnidaria (jellyfish, corals)
What type of animal is a sea anemone?
Arthropod (bugs, crabs)
Mollusc (squid, clams, slugs)
Echinoderm (seastars)
Cnidaria (jellyfish, corals)
What is a feature unique to arthropods (the other invertebrates don't have it)
No backbone
Jointed Legs
Many limbs
can be plankton
Which Invertebrates have bilateral symmetry (select all that apply)
Sponges
Echinoderms
Arthropods
Mollusks
What do crabs, shrimp, and lobsters have in common? Select all that apply
Can live in and out of water
Have hard exoskeletons
Have multiple, jointed limbs
Have compound eyes
The body opening of a gastropod's shell is called the:
aperture
spiral whorl
apex
jumbo
The bulge at the hinge end of a bivalve shell is called the:
umbo
aperture
whorl
rib
Which class does the octopus belong to?
Bivalvia
Polychaeta
Gastropoda
Cephalopoda
Which class within the Phylum Mollusca includes clams?
Bivalvia
Gastropoda
Cephalopoda
Scyphozoa
What is the primary mode of feeding in Phylum Porifera?
Photosynthesis
Filter feeding
Predation
Parasitism
Which Phylum is known for having organisms with a mantle and a radula?
Arthropoda
Annelida
Mollusca
Cnidaria
