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WorksheetsPhylum Mollusca
Total questions: 40
Worksheet time: 2hrs 13mins
Name
Class
Date
1.
Mollusks are acoelomates.
a)
True
b)
False
2.
Mollusks can be aquatic or terrestrial.
a)
True
b)
False
3.
Which of these is NOT one of the three main body parts of a mollusk?
a)
Head
b)
Valve
c)
Foot
d)
Visceral Mass
4.
What is the radula used for?
a)
Locomotion
b)
Feeding
c)
Swimming
d)
Digging
5.
The protective membrane that surrounds the visceral mass on all mollusks is called...
a)
Radula
b)
Mantle
c)
Nephridia
d)
Visceral Shield
6.
The protective shell of a mollusk...
a)
is secreted by the mantle.
b)
Grows from the end of the mollusk foot.
c)
Is constantly replaced by bigger shells as the mollusk grows.
d)
forms when the mollusk reaches adulthood.
7.
All mollusks have an external shell.
a)
True
b)
False
8.
Which of the following is NOT a reason that some mollusks move slowly?
a)
They have a heavy shell.
b)
They have a closed circulatory system.
c)
They have an open circulatory system.
d)
Their muscular foot is not well adapted for speed.
9.
Which of the following is not a potential organ that a mollusk could use for respiration?
a)
Ctenidia
b)
Simple lung
c)
Mantle
d)
Nephridia
10.
How do some organisms in the Class Gastropoda increase the speed of their locomotion?
a)
They fill their shells with air.
b)
They secrete slime from the base of their foot.
c)
They drop their heavy shell while hunting for food.
d)
They temporarily close their circulatory system.
11.
Is this shell "right-handed" or "left-handed"?
a)
Right-handed
b)
Left-handed
12.
Which of the following is NOT true regarding the bulging portion of a bivalve shell?
a)
This is where the muscular foot emerges from.
b)
This is where the hinge is located.
c)
This is the oldest part of the shell.
d)
This is called the umbo.
13.
What is the function of the chromatophores on the mantle of squid, octopus, and cuttlefish?
a)
Secreting the shell
b)
Stinging prey
c)
Camouflage
d)
Move water over gills
14.
Which of the following statements is not true?
a)
A squid has 8 arms and 2 tentacles.
b)
An octopus has 8 tentacles.
c)
A nautilus has 80-90 tentacles.
d)
A cuttlefish has 8 arms and 2 tentacles.
15.
Land snails tend to be hermaphrodites, but many aquatic snails are _____________.
a)
Monoecious
b)
Asexual
c)
Dioecious
d)
Self-fertilizing
16.
Some mollusks with tentacles don't have any suckers. What do they use to help grab prey instead?
a)
They engulf prey with their visceral mass.
b)
Their muscular foot.
c)
Small velcro-like hooks on their tentacles.
d)
Adhesive secretions on their tentacles.
17.
Mollusks possess this type of skeleton.
a)
endoskeleton
b)
exoskeleton
c)
hydrostatic
d)
pneumo
18.
What type of body do all Mollusks have?
a)
Segmented
b)
Soft
c)
Rigid
d)
Clear
19.
In what type of environment do MOST mollusks live?
a)
Soil
b)
Freshwater
c)
Marine
d)
Terrestrial
20.
Which part of the Mollusk body is specialized for burrowing, feeding, and movement?
a)
trochophores
b)
visceral mass
c)
mantle
d)
foot
21.
Which class of Mollusks include organisms that all have two shells?
a)
Gastropods
b)
Bivalves
c)
Cephalopods
22.
Which class of Mollusks includes snails, slugs, or nudibranches?
a)
Cephalapods
b)
Bivalves
c)
Gastropods
23.
Which part of the Mollusk body is the tissue covering the body and secretes the shell?
a)
Mantle
b)
Trochophore
c)
Foot
d)
Visceral Mass
24.
Which class of Mollusks is the only class with some terrestrial species?
a)
Gastropods
b)
Bivalves
c)
Cephalopods
25.
Which part of the Mollusk body contains organs?
a)
Foot
b)
Visceral Mass
c)
Trochophore
d)
Mantle
26.
Which class of Mollusks all have tentacles?
a)
Gastropods
b)
Bivalves
c)
Cephalopods
27.
What type of symmetry do MOST mollusks have?
a)
Bilateral
b)
Radial
c)
Circular
d)
Asymmetrical
28.
Which of the following is the correct description of reproduction in Mollusks?
a)
Mostly asexual
b)
Budding
c)
Regeneration
d)
Mostly sexual
29.
Which of the following is the organ used by Mollusks for excretion?
a)
gills
b)
nephridia
c)
mantle
d)
visceral mass
30.
Which of the following is the correct description of respiration in Mollusks?
a)
They use diffusion through their moist skin and gills in marine environments
b)
They use primitive lungs in marine environments and gills on land.
c)
They use nephridia to exchange oxygen and carbon dioxide
d)
They use gills in marine environments and primitive lungs on land.
31.
Which class of Mollusks have a closed circulatory system?
a)
Gastropods
b)
Bivalves
c)
Cephalopods
d)
All of the classes
32.
Which class of Mollusks include clams, oysters, and mussels?
a)
Gastropods
b)
Bivalves
c)
Cephalopods
33.
Which class of Mollusks include squid, cuttlefish and octopus?
a)
Gastropods
b)
Bivalves
c)
Caphalopods
34.
why do octopuse change there color
a)
Because they like to change colors
b)
They want to be hidden from their predators
c)
To blend in with their surrounding
35.
What is in example of gastropods ?
a)
turtle
b)
squid
c)
a sea slug
36.
a)
Class Gastropoda
b)
Class Bivalvia
c)
Class Cephalopoda
d)
Class Polyplacophora
37.
a)
Class Gastropoda
b)
Class Bivalvia
c)
Class Cephalopoda
d)
Class Polyplacophora
38.
a)
Class Gastropoda
b)
Class Bivalvia
c)
Class Cephalopoda
d)
Class Polyplacophora
39.
Organs that are in contact with blood supply and specialized for gas exchange
a)
trochopore
b)
radulas
c)
bivalves
d)
gills
40.
In the open circulatory system of some mollusks, blood is found
a)
in blood vessels and sinuses
b)
sinuses containing tissues
c)
only in blood vessels
d)
only in gills.
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