Question 1

Which of the following statements about arthropods is FALSE ?

Accepted Answer

A)   Arthropods have a true coelom
B)   Arthropods have an exoskeleton.
C)   Arthropods display segmentation.
D)   Arthropods have an open circulatory system.
E)   Arthropods have an incomplete digestive tract.

Question 2

Figure 31-4  The larva in the accompanying figure is characteristic of which group of organisms?

Accepted Answer

A)   mollusks
B)   cnidarians
C)   nematodes
D)   arthropods
E)   platyhelminthes

Question 3

Figure 31-3  The structure shown in the accompanying figure is from an animal in phylum:

Accepted Answer

A)   Cestoda.
B)   Turbellaria.
C)   Trematoda.
D)   Monogenea.
E)   Platyhelminthes.

Question 4

Complete ____ reduces competition among insects within the same species; larval forms do not compete with adults for food or habitats.

Accepted Answer

A)   mobilization
B)   reproductions
C)   differentiation
D)   morphogenisis
E)   metamorphosis

Question 5

Figure 31-2  Refer to the accompanying figure. What is the structure labeled as 8 in the figure?

Accepted Answer

A)   anus
B)   mouth
C)   ganglia
D)   eyespots
E)   pharynx

Question 6

Which is a unique adaptation in insects not found in any other arthropod?

Accepted Answer

A)   wings
B)   cephalization
C)   segmentation
D)   hard exoskeletons
E)   specialized mouthparts

Question 7

Figure 31-7  Which insect in the accompanying figure represents a group that parasitizes plants?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5

Question 8

Members of the phylum ____ are the simplest organisms with a separate mouth and anus.

Accepted Answer

A)   Platyhelminthes
B)   Ctenophora
C)   Placozoa
D)   Porifera
E)   Cnidaria

Question 9

Members of the Ecdysozoa clade are characterized by having a cuticle. 
____________________

Accepted Answer

A) True 
 B)False

Question 10

The first animals to show cephalization have several characteristics. Which of the following is NOT one of them?

Accepted Answer

A)   These animals were triploblastic.
B)   These animals had a proboscis.
C)   These animals were in phylum Platyhelminthes.
D)   These animals are placed in the group Lophotrochozoa.
E)   These animals followed the protostome pattern of embryonic development.

Question 11

The circulatory system of cephalopods is closed, whereas that of all other mollusks is open. Explain the difference between open and closed circulatory systems, and describe how each system is adequate for the groups possessing it.

Accepted Answer

Concepts to Consider: An open circulator...

Question 12

A radula is characteristic of certain members of phylum Platyhelminthes . 
____________________

Accepted Answer

A) True 
 B)False

Question 13

List two characteristics that have contributed to the biological success of the insects, and briefly explain the adaptive value of each characteristic that you identified.

Accepted Answer

Exoskeleton: protection against predator...

Question 14

Figure 31-2  Refer to the accompanying figure. What label designates the auricles on this organism?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5

Question 15

Ribbon worms have a unique ____ that is used to capture prey.

Accepted Answer

A)   proboscis
B)   tentacle
C)   set of jaws
D)   forked limb
E)   stinging cell

Question 16

One characteristic of class Bivalvia is that they:

Accepted Answer

A)   are active swimmers.
B)   use a radula to feed on algae.
C)   possess two shells with a hinge.
D)   use their mantle for locomotion.
E)   possess shells of overlapping plates.

Question 17

Figure 31-4  Refer to the accompanying figure. What is the structure labeled as 6?

Accepted Answer

A)   anus
B)   gills
C)   cilia
D)   mouth
E)   digestive tract

Question 18

Ctenophores capture food:

Accepted Answer

A)   with filter feeders.
B)   using adhesive glue cells that trap prey.
C)   with stinging hair cells that immobilize small invertebrates.
D)   by digging through the bottom mud for small invertebrates.
E)   with a sticky mucus on their tentacles that capture small invertebrates.

Question 19

Most arachnids have ____ pair(s)  of jointed appendages.

Accepted Answer

A)   one
B)   two
C)   four
D)   six
E)   eight

Question 20

Which is critical to polychaete and oligochaete locomotion?

Accepted Answer

A)   jointed appendages
B)   parapodia
C)   tentacles
D)   setae
E)   fins

Exam 31: Sponges, Cnidarians, Ctenophores, and Protostomes

Members of the phylum ____ are the simplest organisms with a separate mouth and anus.

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Figure 31-4 The larva in the accompanying figure is characteristic of which group of organisms?

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Most arachnids have ____ pair(s) of jointed appendages.

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Members of the Ecdysozoa clade are characterized by having a cuticle. ____________________

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Ribbon worms have a unique ____ that is used to capture prey.

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The first animals to show cephalization have several characteristics. Which of the following is NOT one of them?

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Figure 31-7 Which insect in the accompanying figure represents a group that parasitizes plants?

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Figure 31-2 Refer to the accompanying figure. What is the structure labeled as 8 in the figure?

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Figure 31-2 Refer to the accompanying figure. What label designates the auricles on this organism?

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The circulatory system of cephalopods is closed, whereas that of all other mollusks is open. Explain the difference between open and closed circulatory systems, and describe how each system is adequate for the groups possessing it.

Correct AnswerverifiedConcepts to Consider: An open circulator...View AnswerShow Answer

Complete ____ reduces competition among insects within the same species; larval forms do not compete with adults for food or habitats.

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Which is critical to polychaete and oligochaete locomotion?

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Which is a unique adaptation in insects not found in any other arthropod?

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A radula is characteristic of certain members of phylum Platyhelminthes . ____________________

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Figure 31-4 Refer to the accompanying figure. What is the structure labeled as 6?

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Which of the following statements about arthropods is FALSE ?

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List two characteristics that have contributed to the biological success of the insects, and briefly explain the adaptive value of each characteristic that you identified.

Correct AnswerverifiedExoskeleton: protection against predator...View AnswerShow Answer

Ctenophores capture food:

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Figure 31-3 The structure shown in the accompanying figure is from an animal in phylum:

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One characteristic of class Bivalvia is that they:

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Concepts to Consider: An open circulator...
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Exoskeleton: protection against predator...
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