NAME ______

MOLLUSK TEST

2 points each

MULTIPLE CHOICE:

Circle the letter of the answer that best completes the statement.

Most mollusks (including clams) ______

A. are hermaphrodites

B. use both sexual and asexual reproduction

C. have separate sexes

D. have direct development

Bivalves become SESSILE as adults. This means they ______

  1. stay in one place and don’t move around much
  2. don’t need a partner to reproduce
  3. have their sense organs concentrated in a head area
  4. can camouflage themselves from predators

All mollusks (except cephalopods)have ______circulation.

A. CLOSED

B. OPEN

Bivalves are ______.

  1. filter feeders
  2. carnivorous predators
  3. grazers
  4. parasites

The only mollusks WITHOUT a RADULA are the ______.

A. cephalopods

B. gastropods

C. bivalves

All mollusks are ______.

A. Invertebrate deuterostomes
B. Invertebrate protostomes

C. Vertebrate deuterostomes
D. Vertebrate protostomes

Bivalves have ______symmetry

A. bilateral

B. radial

C. no

All mollusks have a(n)______

A. acoelom

B. pseudocoelom

C. “true” eucoelom

All aquatic mollusks (except cephalopods)have ______development.

A. direct

B. indirect

The only mollusks WITHOUT CEPHALIZATION are the ______.

A. cephalopods

B. gastropods

C. bivalves

The name MOLLUSK comes from the Latin word meaning ______.

A. slow moving

B. soft body

C. headless

D. to creep or crawl

The coelom in a clam is smaller and has become the ______.

A. gill compartment

B. visceral mass

C. mantle cavity

D. pericardial cavity

Bile is ______.

  1. form of nitrogen waste excreted by mollusks
  2. produced by the digestive glandand helps to break down food
  3. a ciliated larva seen in clams
  4. a tongue covered with teeth seen in marine mollusks

The name BIVALVIA comes from the Latin meaning ______

  1. sessile
  2. marine
  3. 2 shells
  4. soft body

The umbo in a clam ______

A. excretes nitrogen waste

B. is the bump on the shell near the hinge

C. has ridges to trap food

D. is a hole that lets water into the clam shell

USE LETTERS FROM THE DIAGRAM TO IDENTIFY THE STRUCTURES:

______MANTLE

______FOOT

______GILLS

______MANTLE CAVITY

______VISCERAL MASS

______INCURRENT SIPHON

______EXCURRENT SIPHON

______ADDUCTOR MUSCLE

***************

BONUS

What color is bile? ______

Tell the specific kind of food that bile works to break down ______

SUPER BONUS ?

What term commonly used to refer to clams in the Eastern United States is frequently heard on this popular TV show?

______

USE LETTERS FROM THE DIAGRAM TO IDENTIFY THE STRUCTURES:

______MANTLE CAVITY

______VISCERAL MASS

______ADDUCTOR MUSCLE

______MANTLE

______FOOT

______GILLS

______EXCURRENT SIPHON

______INCURRENT SIPHON

***************

MATCHING: Match the body part with its function.
(YOU CAN USE THEM MORE THAN ONCE!)

______Flaps near mouth that move food up from gillsA. ADDUCTOR MUSCLES

______Traps food in the mucous on its ridged surfaceB. PALPS

______Collects and removes nitrogen waste in a clamC. INTESTINE

______Collects and removes digestive wasteD. DIGESTIVE GLAND

______Area of the clam’s body that contains the heart, E. MANTLE
digestive, excretory, and reproductive organs

F.GILLS

______Layer that produces the clam’s shell

G. KIDNEY

______Control the opening and closing of the

clam’s shellH. MANTLE CAVITY

______Makes bile to break down food I. PERICARDIAL CAVITY

______Entrance and exit for water entering and leavingJ. VISCERAL MASS
the mantle cavity

K. SIPHONS

______Space surrounding heart

L. HEART

______Pumps hemolymph

______Finishes digestion and absorbs nutrients

______Exchanges oxygen and carbon dioxide with water

______Space inside the clam’s shell between mantle and visceral mass

***************

MATCH THE CLAM BODY ORGAN WITH ITS BODY SYSTEM:

You can use them more than once!

______gillsA. CIRCULATORY

B. DIGESTIVE

______intestineC. RESPIRATORY

D. NERVOUS

______gangliaE. EXCRETORY

______kidney

______heart

______digestive gland

MATCHING: Match the body part with its function.
(YOU CAN USE THEM MORE THAN ONCE!)

______Flaps near mouth that move food up from gillsA. DIGESTIVE GLAND

______Traps food in the mucous on its ridged surfaceB. GILLS

______Collects and removes nitrogen waste in a clamC. HEART

______Collects and removes digestive wasteD. SIPHONS

______Area of the clam’s body that contains the heart, E. INTESTINE
digestive, excretory, and reproductive organs

F. ADDUCTOR MUSCLES

______Layer that produces the clam’s shell

G. MANTLE

______Control the opening and closing of the

clam’s shellH. PERICARDIAL CAVITY

______Makes bile to break down food I. VISCERAL MASS

______Entrance and exit for water entering and leavingJ. MANTLE CAVITY
the mantle cavity

K. PALPS

______Space surrounding heart

L. KIDNEY

______Pumps hemolymph

______Finishes digestion and absorbs nutrients

______Exchanges oxygen and carbon dioxide with water

______Space inside the clam’s shell between mantle and visceral mass

***************

MATCH THE CLAM BODY ORGAN WITH ITS BODY SYSTEM:

You can use them more than once!

______kidneyA. CIRCULATORY

B. DIGESTIVE

______intestineC. RESPIRATORY

D. NERVOUS

______heartE. EXCRETORY

______gills

______ganglia

______digestive gland

MATCH THE WORD WITH ITS DEFINITIONI;

______The twisting of a gastropod larva’s visceral mass 180˚

so the posterior ends up near the front of the animalA. TORSION

______Tongue-like strip with abrasiveB. HEMOLYMPH

teeth used in feeding in some mollusks

C. HEMOCOEL

______Circulatory fluid (blood) in an animal with

open circulationD. FILTER FEEDER

______Organism that strains food from the waterE. CHROMATOPHORE

______A cilitated larva found in many aquatic mollusks F. RADULA
and some annelids

G. TROCHOPHORE

______Pigment cells in the mantle of cephalopods which
can change color to allow them to blend in with
their surroundings

______the SPACE where the blood circulates in an organism
with an open circulatory system

***************

TRUE OR FALSE

Circle T if the statement is TRUE.
Circle F if the statement is FALSE.

TFALL mollusks have a protective shell.

TFThe surface of a clam’s gill is smooth and flat to allow the water

to slide past easily.

TFBile is colorless.

TFThe umbo in a clam is closest to the anterior end.

TFClams have a pair of cerebral ganglia and one ventral nerve cord,
just like an earthworm.

TFThe mantle cavity in a clam is the coelom.

**************

NAME ______

MOLLUSK TEST

2 points each

MATCH THE WORD WITH ITS DEFINITIONI;

______The twisting of a gastropod larva’s visceral mass 180˚

so the posterior ends up near the front of the animalA. RADULA

______Tongue-like strip with abrasiveB. CHROMATOPHORE

teeth used in feeding in some mollusks

C. TROCHOPHORE

______Circulatory fluid (blood) in an animal with

open circulationD. HEMOCOEL

______Organism that strains food from the waterE. HEMOLYMPH

______A cilitated larva found in many aquatic mollusks F. TORSION
and some annelids

G. FILTER FEEDER

______Pigment cells in the mantle of cephalopods which
can change color to allow them to blend in with
their surroundings

______the SPACE where the blood circulates in an organism
with an open circulatory system

***************

TRUE OR FALSE

Circle T if the statement is TRUE.
Circle F if the statement is FALSE.

TFALL mollusks have a protective shell.

TFThe surface of a clam’s gill is smooth and flat to allow the water

to slide past easily.

TFBile is colorless.

TFThe umbo in a clam is closest to the anterior end.

TFClams have a pair of cerebral ganglia and one ventral nerve cord,
just like an earthworm.

TFThe mantle cavity in a clam is the coelom.

MATCH THE DESCRIPTION WITH THE CORRECT MOLLUSK CLASS:

You can use them more than once!

GASTROPODA CEPHALOPODA BIVALVIA

Octopus, squid, and chambered nautilus
Clams, oysters, and scallops
Snails, slugs, nudibranchs,
and conchs
All have 2 shells
Most have ONE shell
Most have NO shell
Group that has chromatophores
Only group WITHOUT a radula
Mollusk group that has TORSION

MATCH THE DESCRIPTION WITH THE CORRECT MOLLUSK CLASS:

GASTROPODA CEPHALOPODA BIVALVIA

Clams, oysters, and scallops
Octopus, squid, and chambered nautilus
Snails, slugs, nudibranchs,
and conchs
Most have NO shell
Most have ONE shell
All have 2 shells
Only group WITHOUT a radula
Mollusk group that has TORSION
Group that has chromatophores

SHORT ANSWER:

LIST 3 CHARACTERISTICS FOUND IN ALL MOLLUSKS

(REMEMBER: Don’t just give me a list of body parts! What makes it a mollusk?)

______

______

______

Clams belong to the:

KINGDOM ______

PHYLUM ______

CLASS ______

Name two (2) of the body systems that release their products into the mantle cavity in a clam.

______

***************

USE WORDS IN THE WORD BANK TO COMPLETE THE FOLLOWING SENTENCE

DORSAL VENTRAL

CLAMS follow the body plan seen in earthworms and other invertebrates because they have ______nerve cords and a ______heart.

SHORT ANSWER:

LIST 3 CHARACTERISTICS FOUND IN ALL MOLLUSKS

(REMEMBER: Don’t just give me a list of body parts! What makes it a mollusk?)

______

______

______

Clams belong to the:

KINGDOM ______

PHYLUM ______

CLASS ______

Name two (2) of the body systems that release their products into the mantle cavity in a clam.

______

***************

USE WORDS IN THE WORD BANK TO COMPLETE THE FOLLOWING SENTENCE

DORSAL VENTRAL

CLAMS follow the body plan seen in earthworms and other invertebrates because they have a ______heart and ______nerve cords.

COMPARE OR CONTRAST:
Fill in the comparison chart below:

Tell one way reproduction in clams and earthworms is ALIKE orDIFFERENT.
Then you pick 2 more characteristics/body systems to compare.
REMEMBER USE SOME SCIENCE WORDS!

Think about what kind of body systems they have!

Characteristic/
BODY SYSTEM / CLAMS / EARTHWORMS
1. Reproductive
2.
3.

***************

BONUS

What color is bile? ______

Tell the specific kind of food that bile works to break down ______

SUPER BONUS ?

What term commonly used to refer to clams in the Eastern United States is frequently heard on this popular TV show?

______

OMPARE OR CONTRAST:
Fill in the comparison chart below:

Tell one way reproduction in clams and earthworms is ALIKE or DIFFERENT.
Then you pick 2 more characteristics/body systems to compare.
REMEMBER USE SOME SCIENCE WORDS!

Think about what kind of body systems they have!

Characteristic/
BODY SYSTEM / EARTHWORMS / CLAMS
1. Reproductive
2.
3.