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7.1 Mollusks Kayla
Vazquez 2nd period
22
Science
6th Grade
03/04/2008

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Cards

Term
Name the characteristics of Mollusks. (5)
Definition
  • Invertebrates
  • Soft-bodies
  • bilateral symmetry
  • usually shelled
  • most live in water
Term
Define Mantle
Definition
  • thin layer of tissue all mollusks have
  • covers body organs

 

 

Term

What are gills?

Definition
the organs that CO2 is exchanged for oxygen while in water
Term

What kind of circulatory system do mollusks have?

 

Definition

Open circulatory system

except for cephalopods which have closed

Term
What is the muscular foot used for?
Definition
movement
Term
What are the 3 most common type of mollusks?
Definition
Gastropods, Bivalaves, Cephalopods
Term

True or False

Gastropods are the smallest group of mollusks...

Definition

FALSE

They are the largest group of mollusks.

Term
List a few examples of gastropods.
Definition
  1. Snails
  2. conchs
  3. whelk
  4. sea and garden slug
  5. abalone
Term
Do gastropods have a single or double shell?
Definition
Single shell
Term
Define radula
Definition
tongue-like organ with rows of teeth to get food (tears and scrapes food)
Term
How do gastropods move?
Definition

contracting the muscular foot

Term
Are gastropods carnivores,herbivores,or omnivores?
Definition
Herbivores
Term
Do bivalves have a single shell or two part shell?
Definition
Two part shell
Term

List a few examples of a bivalve.

Definition
  1. clams
  2. oysters
  3. scallops
Term
How do bivalves move?
Definition
contracting and releasing muscular foot
Term
Do bivalves have an open or closed circulatory system?
Definition
Open
Term
Which group of mollusks are the most complex; gastropods,cephalopods, or bivalves?
Definition
Cephalopods
Term
List some examples of cephalopods.
Definition
  1. squid
  2. octopuses
  3. cuttlefish
Term
Are cephalopods omnivores,herbivores,or carnivores?
Definition
Omnivore
Term
Do cephalopods have an open or closed circulatory system?
Definition
Closed
Term

How do cephalopods move?

Definition
jets of water are forced through a cavity which propels them backwards (jet propulsion)
Term
How long have mollusks been on earth?
Definition
More than 500 million years
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