Question 1

The fluid-filled internal body cavities of animals sometimes function as _______ skeletons for locomotion.

Accepted Answer

The answer of The fluid-filled internal body cavities of animals...

Question 2

Cnidarians have the type of symmetry known as _______ symmetry.

Accepted Answer

A)  asymmetrical 
B)  radial 
C)  spherical 
D)  bilateral 
E)  axial 
A)  asymmetrical 
B)  radial 
C)  spherical 
D)  bilateral 
E)  axial

Question 3

Which statement about anthozoans is true?

Accepted Answer

A)  They reproduce asexually only. 
B)  They are commonly known as jellyfish. 
C)  There are both solitary and colonial species. 
D)  Their gametes are produced directly by the medusa. 
E)  Nematocysts are not common in this group. 
A)  They reproduce asexually only. 
B)  They are commonly known as jellyfish. 
C)  There are both solitary and colonial species. 
D)  Their gametes are produced directly by the medusa. 
E)  Nematocysts are not common in this group.

Question 4

Which statement about colonial animals is false?

Accepted Answer

A)  They include the Portuguese man-of-war. 
B)  They are all genetically identical clones. 
C)  They have arisen only once in evolution. 
D)  In some species, different groups of individuals can be specialized for different functions. 
E)  Members function as a single integrated organism. 
A)  They include the Portuguese man-of-war. 
B)  They are all genetically identical clones. 
C)  They have arisen only once in evolution. 
D)  In some species, different groups of individuals can be specialized for different functions. 
E)  Members function as a single integrated organism.

Question 5

In reptiles, the presence of a large body of acellular yolk within the fertilized egg creates a(n) _______ cleavage pattern in which the dividing cells form an embryo on top of the yolk mass.

Accepted Answer

A)  complete 
B)  radial 
C)  incomplete 
D)  spiral 
E)  determinate 
A)  complete 
B)  radial 
C)  incomplete 
D)  spiral 
E)  determinate

Question 6

In complete metamorphosis, the immature life stage of some organisms before they assume their adult form is called the _______.

Accepted Answer

The answer of In complete metamorphosis, the immature life stage...

Question 7

An infinite number of planes passing through the central point can divide an organism into mirror-image halves in

Accepted Answer

A)  spherically symmetrical organisms. 
B)  radially symmetrical organisms. 
C)  echinoderms. 
D)  bilaterally symmetrical organisms. 
E)  deuterostomes. 
A)  spherically symmetrical organisms. 
B)  radially symmetrical organisms. 
C)  echinoderms. 
D)  bilaterally symmetrical organisms. 
E)  deuterostomes.

Question 8

Diploblastic marine animals with mesoglea between the two cell layers, a complete gut, and locomotion provided by beating cilia are

Accepted Answer

A)  parasites. 
B)  ctenophores. 
C)  scyphozoans. 
D)  anthozoans. 
E)  sponges. 
A)  parasites. 
B)  ctenophores. 
C)  scyphozoans. 
D)  anthozoans. 
E)  sponges.

Question 9

There are three major groups of cnidarians: the anthozoans (which include sessile colonial corals), the scyphozoans (jellyfish), and the _______.

Accepted Answer

The answer of There are three major groups of cnidarians:...

Question 10

Spiral cleavage is found in which of the following taxa?

Accepted Answer

A)  Lophotrochozoans, such as earthworms 
B)  Xenoturbellids 
C)  Ecdysozoans, such as insects 
D)  Hemichordates 
E)  Vertebrates 
A)  Lophotrochozoans, such as earthworms 
B)  Xenoturbellids 
C)  Ecdysozoans, such as insects 
D)  Hemichordates 
E)  Vertebrates

Question 11

Bilateral symmetry

Accepted Answer

A)  is common in ctenophores. 
B)  is correlated with cephalization. 
C)  is a characteristic of animals that move in multiple directions. 
D)  means that two halves of an organism are identical. 
E)  is characteristic of placozoans. 
A)  is common in ctenophores. 
B)  is correlated with cephalization. 
C)  is a characteristic of animals that move in multiple directions. 
D)  means that two halves of an organism are identical. 
E)  is characteristic of placozoans.

Question 12

The first cell divisions of a zygote are known as

Accepted Answer

A)  fertilization. 
B)  cleavage. 
C)  gastrulation. 
D)  differentiation. 
E)  molting. 
A)  fertilization. 
B)  cleavage. 
C)  gastrulation. 
D)  differentiation. 
E)  molting.

Question 13

Which taxa is considered the sister group of all other animals?

Accepted Answer

A)  Sponges 
B)  Placozoans 
C)  Ctenophores 
D)  Cnidarians 
E)  Phoronids 
A)  Sponges 
B)  Placozoans 
C)  Ctenophores 
D)  Cnidarians 
E)  Phoronids

Question 14

Of the more than 9,000 species of sponges, _______ live in fresh water.

Accepted Answer

A)  20 
B)  50 
C)  1,000 
D)  4,500 
E)  8,000 
A)  20 
B)  50 
C)  1,000 
D)  4,500 
E)  8,000

Question 15

Which of the following is false regarding some species of hydrozoans?

Accepted Answer

A)  Some have only a polyp stage. 
B)  Some have only a medusa stage. 
C)  Some are colonial. 
D)  Some can have individual polyps that share a gastrovascular cavity. 
E)  Some have no known sexual reproduction. 
A)  Some have only a polyp stage. 
B)  Some have only a medusa stage. 
C)  Some are colonial. 
D)  Some can have individual polyps that share a gastrovascular cavity. 
E)  Some have no known sexual reproduction.

Question 16

Refer to the table.   Which pairs of characters have states that support deuterostomes as a monophyletic group?

Accepted Answer

A)  6 and 25 
B)  8 and 17 
C)  10 and 22 
D)  18 and 19 
E)  26 and 27 
A)  6 and 25 
B)  8 and 17 
C)  10 and 22 
D)  18 and 19 
E)  26 and 27

Question 17

In the life cycles found among different animals,

Accepted Answer

A)  immature forms can differ from adult forms. 
B)  all animals consume food at all stages. 
C)  animals are mobile at all stages. 
D)  newborn forms always resemble adult forms. 
E)  all newborn forms forage on their own. 
A)  immature forms can differ from adult forms. 
B)  all animals consume food at all stages. 
C)  animals are mobile at all stages. 
D)  newborn forms always resemble adult forms. 
E)  all newborn forms forage on their own.

Question 18

The body cavity of a coelomate organism would act as a hydrostatic skeleton because

Accepted Answer

A)  muscular contraction would cause fluid movement in the cavity. 
B)  the tissues around the cavity are flexible. 
C)  the absence of a peritoneum allows for greater fluid movement. 
D)  segmentation allows for summation of movement. 
E)  the body cavity is positioned between the endoderm and ectoderm, allowing for greater control. 
A)  muscular contraction would cause fluid movement in the cavity. 
B)  the tissues around the cavity are flexible. 
C)  the absence of a peritoneum allows for greater fluid movement. 
D)  segmentation allows for summation of movement. 
E)  the body cavity is positioned between the endoderm and ectoderm, allowing for greater control.

Question 19

What are some of the limitations imposed by a hydrostatic skeleton? Are the limitations the same for aquatic and terrestrial animals?

Accepted Answer

Hydrostatic skeletons provide for contro

Question 20

Segmentation of animals is important evolutionarily because it

Accepted Answer

A)  allows organisms to grow much larger than they could without segmentation. 
B)  has allowed organisms to alter their body forms in complex ways. 
C)  increases the mobility of an organism. 
D)  reduces the surface area-to-volume ratio. 
E)  allows for asexual reproduction. 
A)  allows organisms to grow much larger than they could without segmentation. 
B)  has allowed organisms to alter their body forms in complex ways. 
C)  increases the mobility of an organism. 
D)  reduces the surface area-to-volume ratio. 
E)  allows for asexual reproduction.

Exam 30: Animal Origins and the Evolution of Body Plans

The fluid-filled internal body cavities of animals sometimes function as _______ skeletons for locomotion.

Cnidarians have the type of symmetry known as _______ symmetry.

Which statement about anthozoans is true?

Which statement about colonial animals is false?

In reptiles, the presence of a large body of acellular yolk within the fertilized egg creates a(n) _______ cleavage pattern in which the dividing cells form an embryo on top of the yolk mass.

In complete metamorphosis, the immature life stage of some organisms before they assume their adult form is called the _______.

An infinite number of planes passing through the central point can divide an organism into mirror-image halves in

Diploblastic marine animals with mesoglea between the two cell layers, a complete gut, and locomotion provided by beating cilia are

There are three major groups of cnidarians: the anthozoans (which include sessile colonial corals), the scyphozoans (jellyfish), and the _______.

Spiral cleavage is found in which of the following taxa?

Bilateral symmetry

The first cell divisions of a zygote are known as

Which taxa is considered the sister group of all other animals?

Of the more than 9,000 species of sponges, _______ live in fresh water.

Which of the following is false regarding some species of hydrozoans?

Refer to the table. Which pairs of characters have states that support deuterostomes as a monophyletic group?

In the life cycles found among different animals,

The body cavity of a coelomate organism would act as a hydrostatic skeleton because

What are some of the limitations imposed by a hydrostatic skeleton? Are the limitations the same for aquatic and terrestrial animals?

Segmentation of animals is important evolutionarily because it

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Cells: the Working Units of Life

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