Biology (Raven), 9th Edition

Chapter 34: Coelomate Invertebrates

Post-Test

1
Why are gastropods not internally bilaterally symmetrical like other molluscs?
A)because the internal organs on one side degenerate
B)because of embryonic torsion
C)because of abnormal coelom formation
D)because of coiling of the shell
E)it is not understood
2
In what way do earthworms differ from most polychaetes?
A)They are parasitic.
B)They have a reduced number of segments.
C)They are hermaphroditic.
D)They undergo asexual reproduction.
E)They are parasitic and they have a reduced number of segments.
3
A lophophore is:
A)a phylum of animals.
B)a pore for exchange of water.
C)a structure found in trochophore larvae.
D)a circular ridge around the mouth bearing one or two rows of cilliate tentacles.
E)none of the above
4
Echinoderms show pentaradial symmetry but they are thought to have evolved from bilaterally symmetrical ancestors. What is the evidence for this?
A)the fossil record
B)all other deuterostomes are bilaterally symmetrical
C)their larvae are bilaterally symmetrical
D)homology of the water vascular system with other deuterostomes
E)all of the above
5
What is a particularly characteristic feature of molluscs?
A)the shell
B)segmentation
C)the ctenidia
D)the radula
E)all of the above
6
What important evolutionary innovation is seen in the Annelida?
A)closed circulatory system
B)segmentation
C)parapodia
D)parasitism
E)closed circulatory system and segmentation
7
Lophophorates share some features with protostomes and some with deuterostomes, yet they are classified as protostomes. This is:
A)by convention.
B)because of embryological evidence.
C)because of molecular evidence.
D)because of the type of coelom formation.
E)all of the above
8
What feature(s) of Arthropods has probably led to their great success?
A)the modularity of the segmented body
B)the exoskeleton
C)possession of jointed appendages
D)all of these
E)none of these
9
The echinoderms have a unique:
A)shell.
B)water-vascular system.
C)circulatory system.
D)nervous system.
E)reproductive system.
10
The water-vascular system of a sea star surrounds its
A)tube feet.
B)stomach.
C)anus.
D)esophagus.
E)ampulla.
11
After water enters the water vascular system of a sea star, it will first pass through the tube called a
A)ring canal.
B)ampullae.
C)stone canal.
D)papula.
E)madreporite.
12
Most reproduction in echinoderms is
A)sexual and external.
B)hermaphroditic.
C)asexual by fragmentation.
D)parthenogenic.
E)sexual and internal.
13
Some echinoderms, such as the ________, use their arms to swim.
A)sea lilies
B)sea stars
C)brittle stars
D)sea cucumber
E)sea urchin
14
Sea urchins move by
A)tentacles.
B)flexible arms.
C)movable spines.
D)small pincers.
E)extruded slime.
15
The _____ are the largest class of echinoderms in terms of numbers of species.
A)brittle stars
B)sand dollars
C)sea urchins
D)sea lilies
E)sea stars
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