Question 1

The combination of a true coelom and repeating body segmentation allowed the annelids to

Accepted Answer

A)  evolve complex body shapes and control movement more precisely. 
B)  move through loose marine sediments. 
C)  become hermaphroditic. 
D)  inject paralytic poisons into their prey. 
E)  become larger than their ancestors. 
A)  evolve complex body shapes and control movement more precisely. 
B)  move through loose marine sediments. 
C)  become hermaphroditic. 
D)  inject paralytic poisons into their prey. 
E)  become larger than their ancestors.

Question 2

The rhynchocoel is a body plan feature found only in

Accepted Answer

A)  bryozoans. 
B)  flatworms. 
C)  rotifers. 
D)  ribbon worms. 
E)  brachiopods. 
A)  bryozoans. 
B)  flatworms. 
C)  rotifers. 
D)  ribbon worms. 
E)  brachiopods.

Question 3

The arthropod exoskeleton is composed of a

Accepted Answer

A)  mixture of several kinds of polysaccharides. 
B)  mixture of several kinds of proteins. 
C)  single complex polysaccharide called chitin. 
D)  single complex protein called arthropodin. 
E)  mixture of layers of proteins and a polysaccharide called chitin. 
A)  mixture of several kinds of polysaccharides. 
B)  mixture of several kinds of proteins. 
C)  single complex polysaccharide called chitin. 
D)  single complex protein called arthropodin. 
E)  mixture of layers of proteins and a polysaccharide called chitin.

Question 4

Which of the following statements describes locomotion in nematodes?

Accepted Answer

A)  Rhythmically beating cilia move the animal forward. 
B)  Circular and longitudinal muscles work against each other and the pseudocoelom to change the shape of the animal, moving it forward. 
C)  Longitudinal muscles contract. 
D)  A series of hairs that project backward engage the substrate; back-and-forth movements propel the animal forward. 
E)  Water expelled through special ducts moves the animal forward. 
A)  Rhythmically beating cilia move the animal forward. 
B)  Circular and longitudinal muscles work against each other and the pseudocoelom to change the shape of the animal, moving it forward. 
C)  Longitudinal muscles contract. 
D)  A series of hairs that project backward engage the substrate; back-and-forth movements propel the animal forward. 
E)  Water expelled through special ducts moves the animal forward.

Question 5

Which of the following statements about mollusks is false?

Accepted Answer

A)  The body plan of mollusks is tripartite. 
B)  The ancestor of modern mollusks was likely an unsegmented, worm-like animal. 
C)  The foot may have different functions in different mollusks. 
D)  The visceral mass secretes the shell that is typical of many mollusks. 
E)  Monoplacophorans were the most abundant mollusks during the Cambrian period. 
A)  The body plan of mollusks is tripartite. 
B)  The ancestor of modern mollusks was likely an unsegmented, worm-like animal. 
C)  The foot may have different functions in different mollusks. 
D)  The visceral mass secretes the shell that is typical of many mollusks. 
E)  Monoplacophorans were the most abundant mollusks during the Cambrian period.

Question 6

The outer covering of ecdysozoans

Accepted Answer

A)  is always hard and rigid. 
B)  is always thin and flexible. 
C)  is hard and rigid in larvae but thin in adults. 
D)  ranges from very thin to hard and rigid depending on the species. 
E)  grows throughout life to accommodate a growing body. 
A)  is always hard and rigid. 
B)  is always thin and flexible. 
C)  is hard and rigid in larvae but thin in adults. 
D)  ranges from very thin to hard and rigid depending on the species. 
E)  grows throughout life to accommodate a growing body.

Question 7

Annelids

Accepted Answer

A)  thrive in dry environments. 
B)  are not lophotrochozoans. 
C)  have unsegmented bodies. 
D)  have a coelom. 
E)  have a rigid exterior coating. 
A)  thrive in dry environments. 
B)  are not lophotrochozoans. 
C)  have unsegmented bodies. 
D)  have a coelom. 
E)  have a rigid exterior coating.

Question 8

Some familiar marine arthropods are crabs, lobsters, and shrimps, all of which are _______.

Accepted Answer

The answer of Some familiar marine arthropods are crabs, lobsters,...

Question 9

All oligochaetes

Accepted Answer

A)  have eyes. 
B)  have anterior tentacles. 
C)  are hermaphrodites. 
D)  have complete metamorphosis. 
E)  have parapodia. 
A)  have eyes. 
B)  have anterior tentacles. 
C)  are hermaphrodites. 
D)  have complete metamorphosis. 
E)  have parapodia.

Question 10

The majority of terrestrial arthropod species are

Accepted Answer

A)  myriapods. 
B)  hexapods. 
C)  cirripeds. 
D)  tardigrades. 
E)  onychophorans. 
A)  myriapods. 
B)  hexapods. 
C)  cirripeds. 
D)  tardigrades. 
E)  onychophorans.

Question 11

_______ can survive for at least 10 years in a dormant, dehydrated state.

Accepted Answer

A)  Myriapods 
B)  Onychophorans 
C)  Pycnogonids 
D)  Tardigrades 
E)  Trilobites 
A)  Myriapods 
B)  Onychophorans 
C)  Pycnogonids 
D)  Tardigrades 
E)  Trilobites

Question 12

Members of which of the following groups have a pseudocoel?

Accepted Answer

A)  Arrow worms and horsehair worms 
B)  Horsehair worms and nematodes 
C)  Horsehair worms, nematodes, and arrow worms 
D)  Nematoda, chelicerates, and arrow worms 
E)  Horsehair worms, nematodes, and hexapods 
A)  Arrow worms and horsehair worms 
B)  Horsehair worms and nematodes 
C)  Horsehair worms, nematodes, and arrow worms 
D)  Nematoda, chelicerates, and arrow worms 
E)  Horsehair worms, nematodes, and hexapods

Question 13

Which of the following statements about rotifers is false?

Accepted Answer

A)  They have a complete gut with an anterior mouth and posterior anus. 
B)  They are coelomates. 
C)  The corona is a ciliated organ used in acquiring food. 
D)  They have a hydrostatic skeleton. 
E)  They are very small, between 50 and 500 µm long. 
A)  They have a complete gut with an anterior mouth and posterior anus. 
B)  They are coelomates. 
C)  The corona is a ciliated organ used in acquiring food. 
D)  They have a hydrostatic skeleton. 
E)  They are very small, between 50 and 500 µm long.

Question 14

Which group of arthropods flourished in the Cambrian and Ordovician but went extinct about 251 mya?

Accepted Answer

A)  Onchyphorans 
B)  Tardigrades 
C)  Trilobites 
D)  Myriapods 
E)  Chelicerates 
A)  Onchyphorans 
B)  Tardigrades 
C)  Trilobites 
D)  Myriapods 
E)  Chelicerates

Question 15

The letters pter occur in the names of many insect groups. Can you discover the Greek word that is the root of this nomenclature? (Hint: The same word is the root name for a well-known dinosaur group, the pterodactyls.) Most good dictionaries give the meanings of word prefixes and roots; using such a dictionary, determine the meaning of the following names of insect groups:
Apterygota
Ephemeroptera
Orthoptera
Isoptera
Hemiptera
Homoptera
Coleoptera
Trichoptera
Lepidoptera
Diptera
Hymenoptera
Siphonaptera

Accepted Answer

As a root or prefix, pter comes from the

Question 16

The oligochaetes are _______; each organism has both male and female sex organs.

Accepted Answer

The answer of The oligochaetes are _______; each organism has...

Question 17

An insect that exhibits gradual changes between its instars is said to undergo _______.

Accepted Answer

incomplete

Question 18

The wingless insects belong to which of the following groups?

Accepted Answer

A)  Apterygotes 
B)  Pterygotes 
C)  Myriapods 
D)  Arachnids 
E)  Chelicerates 
A)  Apterygotes 
B)  Pterygotes 
C)  Myriapods 
D)  Arachnids 
E)  Chelicerates

Question 19

A distinguishing feature of mollusks is the _______, a sheet of specialized tissue that covers the internal organs like a body wall and secretes the shell.

Accepted Answer

The answer of A distinguishing feature of mollusks is the...

Question 20

Ecdysozoans

Accepted Answer

A)  are a polyphyletic group. 
B)  all have a thick, hard exoskeleton. 
C)  all have an exoskeleton that is composed of protein and chitin. 
D)  all have a cuticle. 
E)  all have jointed appendages. 
A)  are a polyphyletic group. 
B)  all have a thick, hard exoskeleton. 
C)  all have an exoskeleton that is composed of protein and chitin. 
D)  all have a cuticle. 
E)  all have jointed appendages.

Exam 32: Protostome Animals

The combination of a true coelom and repeating body segmentation allowed the annelids to

The rhynchocoel is a body plan feature found only in

The arthropod exoskeleton is composed of a

Which of the following statements describes locomotion in nematodes?

Which of the following statements about mollusks is false?

The outer covering of ecdysozoans

Annelids

Some familiar marine arthropods are crabs, lobsters, and shrimps, all of which are _______.

All oligochaetes

The majority of terrestrial arthropod species are

_______ can survive for at least 10 years in a dormant, dehydrated state.

Members of which of the following groups have a pseudocoel?

Which of the following statements about rotifers is false?

Which group of arthropods flourished in the Cambrian and Ordovician but went extinct about 251 mya?

The oligochaetes are _______; each organism has both male and female sex organs.

An insect that exhibits gradual changes between its instars is said to undergo _______.

The wingless insects belong to which of the following groups?

A distinguishing feature of mollusks is the _______, a sheet of specialized tissue that covers the internal organs like a body wall and secretes the shell.

Ecdysozoans

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