Question 1

_______have open circulatory systems, a complete digestive tract, and a reduction of the coelom.

Accepted Answer

A)  Rotifers 
B)  Annelids 
C)  Mollusks 
D)  Nematodes 
E)  Flatworms 
A)  Rotifers 
B)  Annelids 
C)  Mollusks 
D)  Nematodes 
E)  Flatworms

Question 2

A thick cuticle provides an animal with protection, but it also can seal it off from the external environment, obstructing the exchange of gases.How do animals overcome this?

Accepted Answer

The insects have overcome this problem w

Question 3

Animals with thin cuticles are generally restricted to moist habitats because

Accepted Answer

A)  a thin cuticle allows water to be lost across the body surface. 
B)  there are fewer predators in these types of habitats. 
C)  these animals rely on flowing water to bring them food. 
D)  an animal moving through a moist habitat encounters less friction. 
E)  moist habitats increase efficiency of the lophophore. 
A)  a thin cuticle allows water to be lost across the body surface. 
B)  there are fewer predators in these types of habitats. 
C)  these animals rely on flowing water to bring them food. 
D)  an animal moving through a moist habitat encounters less friction. 
E)  moist habitats increase efficiency of the lophophore.

Question 4

Which statement about bryozoans is false?

Accepted Answer

A)  Almost all are marine organisms. 
B)  They live in colonies. 
C)  A colony grows by sexual reproduction. 
D)  Eggs are fertilized internally. 
E)  They have lophophores. 
A)  Almost all are marine organisms. 
B)  They live in colonies. 
C)  A colony grows by sexual reproduction. 
D)  Eggs are fertilized internally. 
E)  They have lophophores.

Question 5

Which statement about the difference between larval and adult forms of insects is false?

Accepted Answer

A)  Larvae and adults feed on different food sources. 
B)  Larvae are specialized to eat and grow, adults are not. 
C)  Larvae, as well as adults, produce gametes. 
D)  Larvae go through several molts to before becoming adults. 
E)  Adults are specialized for reproduction. 
A)  Larvae and adults feed on different food sources. 
B)  Larvae are specialized to eat and grow, adults are not. 
C)  Larvae, as well as adults, produce gametes. 
D)  Larvae go through several molts to before becoming adults. 
E)  Adults are specialized for reproduction.

Question 6

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

Question 7

One clade of polychaetes, the pogonophorans,

Accepted Answer

A)  were discovered in the nineteenth century. 
B)  live in high densities in shallow waters. 
C)  have a well-developed digestive tract. 
D)  can harbor bacteria that oxidize hydrogen sulfide. 
E)  are thought to be the ancestor of clitellates. 
A)  were discovered in the nineteenth century. 
B)  live in high densities in shallow waters. 
C)  have a well-developed digestive tract. 
D)  can harbor bacteria that oxidize hydrogen sulfide. 
E)  are thought to be the ancestor of clitellates.

Question 8

The following are all characteristics of earthworms: segmented bodies, a spiral cleavage pattern, a terrestrial lifestyle, a complete gut, a blastopore that develops into a mouth, tight junctions between cells, and bilateral symmetry.In what order did these characteristics evolve?

Accepted Answer

The first of these characteristics to ev

Question 9

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

Accepted Answer

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

Question 10

Horseshoe crabs are called living fossils because they

Accepted Answer

A)  live in holes in rocks. 
B)  are chelicerates, a primitive clade. 
C)  are morphologically similar to fossil horseshoe crabs from millions of years ago. 
D)  crawl into the intertidal zone in large numbers to mate and lay eggs. 
E)  scavenge and prey on bottom-dwelling animals. 
A)  live in holes in rocks. 
B)  are chelicerates, a primitive clade. 
C)  are morphologically similar to fossil horseshoe crabs from millions of years ago. 
D)  crawl into the intertidal zone in large numbers to mate and lay eggs. 
E)  scavenge and prey on bottom-dwelling animals.

Question 11

In _______, air sacs and tubular channels called tracheae are responsible for gas exchange with cells.

Accepted Answer

A)  gastropods 
B)  rotifers 
C)  arachnids 
D)  myriapods 
E)  insects 
A)  gastropods 
B)  rotifers 
C)  arachnids 
D)  myriapods 
E)  insects

Question 12

Unlike in all other living mollusks, in _______ the gas exchange organs, muscles, and excretory pores are repeated over the length of the body.These organisms were the most abundant mollusks during the Cambrian period, 500 million years ago, but only a few species survive today.

Accepted Answer

A)  chitons 
B)  cephalopods 
C)  bivalves 
D)  gastropods 
E)  monoplacophorans 
A)  chitons 
B)  cephalopods 
C)  bivalves 
D)  gastropods 
E)  monoplacophorans

Question 13

Spiral cleavage is found in a subset of lophotrochozoans, including the ribbon worms, annelids, and

Accepted Answer

A)  phoronids. 
B)  mollusks. 
C)  bryozoans. 
D)  rotifers. 
E)  arrow worms. 
A)  phoronids. 
B)  mollusks. 
C)  bryozoans. 
D)  rotifers. 
E)  arrow worms.

Question 14

Approximately what proportion of living species on Earth are insects?

Accepted Answer

A)  43 percent 
B)  25 percent 
C)  80 percent 
D)  56 percent 
E)  10 percent 
A)  43 percent 
B)  25 percent 
C)  80 percent 
D)  56 percent 
E)  10 percent

Question 15

In prescientific times, a discredited notion held that human health depended on the correct balance of four "humors," including blood, which was not known to circulate.At that time, leeches were used in bleeding to supposedly reduce the amount of blood as a humor, but today

Accepted Answer

A)  leeches are used to eliminate pools of coagulated blood. 
B)  ticks are used to encourage bleeding. 
C)  earthworms are used to reduce blood throughout the body. 
D)  there is no use of leeches in medicine. 
E)  leeches are important in soil development. 
A)  leeches are used to eliminate pools of coagulated blood. 
B)  ticks are used to encourage bleeding. 
C)  earthworms are used to reduce blood throughout the body. 
D)  there is no use of leeches in medicine. 
E)  leeches are important in soil development.

Question 16

Refer to the figure.   This organisms shown are

Accepted Answer

A)  ticks. 
B)  trilobites. 
C)  horseshoe crabs. 
D)  myriapods. 
E)  hexapods. 
A)  ticks. 
B)  trilobites. 
C)  horseshoe crabs. 
D)  myriapods. 
E)  hexapods.

Question 17

Insects differ from other hexapods in that most groups possess

Accepted Answer

A)  paired wings. 
B)  three body regions: head, thorax, and abdomen. 
C)  a dorsal nerve cord. 
D)  six pairs of appendages. 
E)  an exoskeleton. 
A)  paired wings. 
B)  three body regions: head, thorax, and abdomen. 
C)  a dorsal nerve cord. 
D)  six pairs of appendages. 
E)  an exoskeleton.

Question 18

Refer to the figure.   Which of the following correctly names the organisms shown, from left to right?

Accepted Answer

A)  Kinorhynch, priapulid, loriciferan 
B)  Loriciferan, kinorhynch, priapulid 
C)  Priapulid, loriciferan, kinorhynch 
D)  Priapulid, kinorhynch, loriciferan 
E)  Loriciferan, priapulid, kinorhynch, 
A)  Kinorhynch, priapulid, loriciferan 
B)  Loriciferan, kinorhynch, priapulid 
C)  Priapulid, loriciferan, kinorhynch 
D)  Priapulid, kinorhynch, loriciferan 
E)  Loriciferan, priapulid, kinorhynch,

Question 19

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

Accepted Answer

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

Question 20

A head with complex sensory organs, including eyes that are comparable to those of vertebrates in their ability to resolve images, is found in

Accepted Answer

A)  gastropods. 
B)  cephalopods. 
C)  bivalves. 
D)  chitons. 
E)  polychaetes. 
A)  gastropods. 
B)  cephalopods. 
C)  bivalves. 
D)  chitons. 
E)  polychaetes.

Exam 31: Protostome Animals

_______have open circulatory systems, a complete digestive tract, and a reduction of the coelom.

A thick cuticle provides an animal with protection, but it also can seal it off from the external environment, obstructing the exchange of gases.How do animals overcome this?

Animals with thin cuticles are generally restricted to moist habitats because

Which statement about bryozoans is false?

Which statement about the difference between larval and adult forms of insects is false?

Annelids

One clade of polychaetes, the pogonophorans,

The following are all characteristics of earthworms: segmented bodies, a spiral cleavage pattern, a terrestrial lifestyle, a complete gut, a blastopore that develops into a mouth, tight junctions between cells, and bilateral symmetry.In what order did these characteristics evolve?

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

Horseshoe crabs are called living fossils because they

In _______, air sacs and tubular channels called tracheae are responsible for gas exchange with cells.

Unlike in all other living mollusks, in _______ the gas exchange organs, muscles, and excretory pores are repeated over the length of the body.These organisms were the most abundant mollusks during the Cambrian period, 500 million years ago, but only a few species survive today.

Spiral cleavage is found in a subset of lophotrochozoans, including the ribbon worms, annelids, and

Approximately what proportion of living species on Earth are insects?

In prescientific times, a discredited notion held that human health depended on the correct balance of four "humors," including blood, which was not known to circulate.At that time, leeches were used in bleeding to supposedly reduce the amount of blood as a humor, but today

Refer to the figure. This organisms shown are

Insects differ from other hexapods in that most groups possess

Refer to the figure. Which of the following correctly names the organisms shown, from left to right?

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

A head with complex sensory organs, including eyes that are comparable to those of vertebrates in their ability to resolve images, is found in

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