MOLLUSK REVIEW (we did this in class)

1.  Type of body cavity found in MOLLUSKS

       Acoelom         Pseudocoelom            Eucoelom


2.  The free swimming ciliated larva seen in all mollusks except cephalopods is called a ____________________


3.  Type of circulatory system found in bivalves and gastropods.

              OPEN               CLOSED


4. The flexible tongue-like strip covered with abrasive teeth that is found in all mollusks except bivalves is called a _____________________.

5.  Which organ is used by clams for respiration? 

6.  The octopus, squid, and chambered nautilus belong to the CLASS of mollusks called

7.  The bump on the dorsal edge of a clam shell is called the ______________


  8.   Pigment cells, called ___________________ located in the outer mantle, allow cephalopod to change color and blend in with their surroundings.

9.  Bivalves are SESSILE as adults.
      What does this mean?

10.   Slugs and snails belong to the CLASS of Mollusks called _______________.

              Bivalves               Gastropods           Cephalopods


11.  Name the two functions of the gills in a clam.

12.  Only group of mollusks that does NOT have an open circulatory system or a trochophore larva.

                Bivalves               Gastropods           Cephalopods

13.   The circulatory fluid in a clam is called

14.    Gastropods undergo a process called ___________in which their visceral mass twists 180 o 
so the gills, anus, and mantle cavity end up at the front end of the animal.  

The function of M is to ____________________________


16.  The area above the foot that contains the heart, digestive, excretory, and reproductive organs is called the ______________________


17. Which kind of mollusks are FILTER FEEDERS?

Bivalves                Gastropods           Cephalopods



     18.  G = ______________


19.  The function of E is to



20.  The layer that secretes the shell in a clam is the ____________________

21.  The structure that wraps around the intestine and pumps hemolymph is the_______________.

   22.  TRUE   or   FALSE

         Clams have a nervous system like an earthworm.

23.  Name the 4 body systems in a clam that use the mantle cavity.

24.  Mollusks are _________________.


25. Which letter is pointing to the INCURRENT SIPHON? 


26. What color is bile?

27. Give a function for the digestive gland.

28. TRUE or FALSE 
    Nitrogen waste exits through the anus in a clam

29. Tell one way clams are different from earthworms.

30. Tell one way clams and earthworms are alike.







1. Eucoelom 
2. Trochophore
3.  OPEN
4.  Radula
5.  Gills
6.  Cephalopods
7.  UMBO
8.  Chromatophores
9.  Stay in one place
10. Gastropods
11.  Trap food & exchange gases
12.  Cephalopods
13.  Hemolymph
14.  torsion
15.  move food up from gills to mouth
16.  visceral mass
17.  Bivalves are filter feeders
18.  excurrent siphon
19.  remove nitrogen waste
20.  mantle
21.  heart
22.  False: 
      earthworms have 2 cerebral ganglia and 1 ventral nerve cord
      Clams have 3 pairs of ganglia; and 4 nerve cords throughout their bodies
Digestive (digestive waste is released from anus here)
     Excretory (nitrogen waste is released by kidney here)
     Reproductive (sperm or eggs released here; internal fertilization happens here)
    Respiratory (gills are located here)
24. Invertebrate protostomes (* By the way: There is no such thing as vertebrate protostomes)
25.  H
26. green
27. make bile, finish digestion, absorb nutrients
28. FALSE: Keep your waste straight!
    Nitrogen waste is collected by kidney and is released into mantle cavity. 
    DIGESTIVE WASTE (FECES) exits through the ANUS!


Open circulation Closed circulation
Separate sexes Hermaphrodites
no cephalization cephalization
3 pairs ganglia/
2 pairs nerve cords
1 pair cerebral ganglia/
1 nerve cord
kidneys nephridia
gills breathe through skin
have either internal (fresh) OR external (marine) fertilization depending on environment external fertilization only
indirect developement (trochophore) direct development

30. Both CLAMS and EARTHWORMS are/have:
    Invertebrate protostomes
    Dorsal heart/ventral nerve cord
    2 opening digestive system
       use sexual reproduction
    bilateral symmetry
    hydrostatic skeleton