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What type of symmetry do molluscs have?
Bilateral symmetry
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What is the level of organization of Molluscs?
Organ Level
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Are Molluscs Triploblastic or Diploblastic?
Triploblastic
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Are Molluscs acoelomates, pseudocoelomates, or eucoelomates?
eucoelomates
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What type of body plan do Molluscs have?
Tube-within-a-tube
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With regards to the number of species, where does the phylum mollusca rank?
2nd largest phylum
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What organ secrets the shell of a mollusc?
mantle
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Why do animals need oxygen?
Cellular respiration for energy
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what are the characteristics of a respiratory organ in molluscs?
it is exposed to the enviorment, thin, and moist
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What type of circulatory system do most molluscs have?
Open
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What part of the mollusc heart pumps blood?
ventrical
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What type of reproduction do Molluscs have?
Sexual Reproduction
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Where does fertilization occur in most Molluscs?
female's mantle cavity
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What type of larvae are common to many marine molluscs and annelids?
trochophore larvae (free swimming)
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What is the largest Mollusc?
Giant Squid
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To what phylum are molluscs most closely related?
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Which class includes molluscs with a closed circulatory system?
Class Cephalopoda
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Which class from the phylum Mollusca includes terrestrial species?
Class Gastrooda
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Which mollusc class includes all marine animals?
Class Cephalopoda
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Which is the largest Mollusc Class?
Class Arthropoda
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Which class includes molluscs that do NOT have a radula?
Class Bivalvia
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Which class of molluscs are filter-feeders?
Class Bivalvia
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In which Mollusc class is torsion common?
Class Gastropoda
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Class Monoplacophora~
What type of animals are included?
Neopilina
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Class Monoplacophora~
Where do these animals live?
Deep oceans
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Class Monoplacophora~
What is the distinguishing characteristic of these animals?
Metamerism (repetition of similar body parts)
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Class Monoplacophora~
Why are these animals phylogenically important?
They have links to molluscs and annelids
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Class Polyplachophora~
What types of animals are included?
Chitons
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Class Polyplachophora~
Describe their shells
8 dorsal plates
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Class Polyplachophora~
Where do these animals live?
- Marine
- Found in Rocky Shores
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Class Polyplachophora~
Whst do these animals eat?
algae
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Class Polyplachophora~
How do these animals find their way back to their "home rock" if washed away by the surf?
Homing tendancy
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Class Polyplachophora~
How do these animals protect themselves?
They can roll up into a ball
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Class Scaphopoda~
What type of animals are included?
Tusk or toothshells
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Class Scaphopoda~
Describe their shell.
Shell opens at both ends
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Class Scaphopoda~
Where do these animals live?
Bottom Dwellers, Sand
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Class Scaphopoda~
What special structures do these animals have for feeding?
Captacula(used to capture food)
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Class Scaphopoda~
What are the shells of these animals used for?
trade, jewelry, clothes decorations
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Class Bivalvia~
What type of animals are included?
Clams and Mussels
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Class Bivalvia~
Describe their shell
2 lateral valves connected with a hinge
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Class Bivalvia~
Where do these animals live?
Mostly marine, some freshwater
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Class Bivalvia~
What are their feeding habits?
filter-feeders
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Class Bivalvia~
How is a pearl produced?
Layers of nacre form around an irritant produced by the mantle
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Class Bivalvia~
What kind of larvae do freshwater clams have?
Veligar
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Class Bivalvia~
What are their economic uses?
Pearls and food
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Class Bivalvia~
What special structure do some bivalves have taht keep them from being washed away by the surf?
Bussus threads
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Class Gastropoda~
What other name do thses animals go by?
univalves
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Class Gastropoda~
What type of animals are included?
Snails, slugs, conchs
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Class Gastropoda~
Describe their shells
Coiled shell (shell may be absent)
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Class Gastropoda~
Where do these animals live?
Mostly marine, freshwater, terrestrial
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Class Gastropoda~
What are the feeding habits?
hervivores and carnivores
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Class Gastropoda~
What is the advantage of torsion?
Allows head to be drawn into the mantle cavity for protectiom
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Class Gastropoda~
What is the disadvantage of torsion? What solutions evolved as a result?
fouling ~had to be overcome
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Class Gastropoda~
economic uses
food and currency
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Class Cephalopoda~
What types of animals are included?
octopus, squid, cuttlefish, nautilus
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Class Cephalopoda~
Where do these animals live?
All marine
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Class Cephalopoda~
What are their feeding habits?
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Class Cephalopoda~
Economic uses?
food
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Class Cephalopoda~
Which animal does NOT have a shell?
Octopus
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Class Cephalopoda~
Which animal's internal shell made of cartilage?
Squid
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Class Cephalopoda~
Which animal's internal shell is made of calcium?
Cuttlefish
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Class Cephalopoda~
Which animal has an external shell with internal chambers?
Nautilus
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Class Cephalopoda~
How do they swim?
"jet propulsion" expell water through funnel
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Class Cephalopoda~
function of chromatophores?
Changes color, used for protection
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Class Cephalopoda~
What is unusual about the reproductive habits of female octopuses?
Females guard eggs and die after they hatch
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Class Cephalopoda~
Which animal does NOT have sepia (ink)?
Nautilus
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Class Cephalopoda~
What is the function of the ink?
Protection and to confuse predators
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~Class Cephalopoda~
How are cephalopods more advanced than other molluscs?
have 2 hearts that pump blood to gills, 1 heart for the rest of the body~ high levels of activity
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