Georgia Science Grade 7

Chapter 13: Mollusks, Worms, Arthropods, Echinoderms

CRCT Practice

1
Which is not a mollusk?
A)clam
B)snail
C)crab
D)squid
2
This mollusk uses which to exchange carbon dioxide with oxygen from the water?

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A)radula
B)gill
C)mantle
D)shell
3
Which structure covers the body organs of this mollusk?

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A)radula
B)gill
C)mantle
D)shell
4
This organism is an example of what type of mollusk?

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A)gastropod
B)bivalve
C)cephalopod
D)monovalve
5
How do these animals move?

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A)a muscular foot
B)tentacles
C)contraction and relaxation
D)jet propulsion
6
What does the word annelid mean?
A)segmented
B)bristled
C)little rings
D)worms
7
What are bristlelike structures on the outside of each body segment of annelids?
A)crops
B)gizzards
C)radula
D)setae
8
Which openings allow air to enter an insect's body?
A)spiracles
B)gills
C)thorax
D)setae
9
What is the largest group of animals?
A)arthropods
B)cephalopods
C)gastropods
D)annelids
10
What is it called when an arthropod loses its exoskeleton and replaces it with a new one?
A)shedding
B)molting
C)manging
D)exfoliating
11
What type of classification does this animal have?

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A)cnidarian
B)echinoderm
C)mollusk
D)sponge
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