Question 1

Which cnidarian group is dominated by species that live symbiotically with photosynthetic protists?

Accepted Answer

A)  Hydrozoans 
B)  Ctenophores 
C)  Scyphozoans 
D)  Anthozoans 
E)  Placozoans 
A)  Hydrozoans 
B)  Ctenophores 
C)  Scyphozoans 
D)  Anthozoans 
E)  Placozoans

Question 2

Explain the fundamental difference between protostomes and deuterostomes. What evidence supports dividing organisms into these two clades?

Accepted Answer

Protostomes and deuterostomes differ in

Question 3

Discuss the two major strategies animals use to get food, and indicate which of these would most likely be used by sessile organisms.

Accepted Answer

Animals can either move through the envi

Question 4

Which of the following feeding strategies is most likely to be associated with a sessile organism?

Accepted Answer

A)  Filter feeding 
B)  Herbivory 
C)  Predation 
D)  Parasitism 
E)  Detritus feeding 
A)  Filter feeding 
B)  Herbivory 
C)  Predation 
D)  Parasitism 
E)  Detritus feeding

Question 5

What is the main difference between a coelom and a pseudocoelom?

Accepted Answer

A)  A coelom is enclosed by muscles on the outside only; a pseudocoelom is enclosed by muscles on the inside only. 
B)  A coelom does not have an enclosed body cavity; a pseudocoelom is completely surrounded by muscle. 
C)  A coelom is enclosed by muscles on the inside only; a pseudocoelom is a solid structure. 
D)  A coelom is enclosed by muscles on the inside and the outside; a pseudocoelom is surrounded by muscle on the outside of the body cavity. 
E)  None of the above 
A)  A coelom is enclosed by muscles on the outside only; a pseudocoelom is enclosed by muscles on the inside only. 
B)  A coelom does not have an enclosed body cavity; a pseudocoelom is completely surrounded by muscle. 
C)  A coelom is enclosed by muscles on the inside only; a pseudocoelom is a solid structure. 
D)  A coelom is enclosed by muscles on the inside and the outside; a pseudocoelom is surrounded by muscle on the outside of the body cavity. 
E)  None of the above

Question 6

Animals that live in or on another organism and obtain nutrients from it are known as _______.

Accepted Answer

The answer of Animals that live in or on another...

Question 7

Which of the following statements about ctenophores is true?

Accepted Answer

A)  Muscle contractions propel them through the water. 
B)  They are triploblastic. 
C)  They are asymmetric. 
D)  They have a complete gut. 
E)  They have complicated life cycles. 
A)  Muscle contractions propel them through the water. 
B)  They are triploblastic. 
C)  They are asymmetric. 
D)  They have a complete gut. 
E)  They have complicated life cycles.

Question 8

Which of the following statements about the symmetry of organisms is false?

Accepted Answer

A)  Radial symmetry is common in ctenophores and cnidarians. 
B)  Radial symmetry is common in segmented animals. 
C)  Spherical symmetry is common in unicellular protists. 
D)  The back of a bilaterally symmetric organism is the dorsal surface. 
E)  Sensory organs in a bilaterally symmetric organism are located on the anterior end of the organism. 
A)  Radial symmetry is common in ctenophores and cnidarians. 
B)  Radial symmetry is common in segmented animals. 
C)  Spherical symmetry is common in unicellular protists. 
D)  The back of a bilaterally symmetric organism is the dorsal surface. 
E)  Sensory organs in a bilaterally symmetric organism are located on the anterior end of the organism.

Question 9

Use the following to answer questions :
Refer to the diagram below, showing an animal cross-section.  
-Identify the labeled structures.

Accepted Answer

A: Endoderm
B: Perit

Question 10

The bilaterally symmetrical larval form found in many crustaceans is called a

Accepted Answer

A)  trochophore. 
B)  nauplius. 
C)  planula. 
D)  caterpillar. 
E)  polyp. 
A)  trochophore. 
B)  nauplius. 
C)  planula. 
D)  caterpillar. 
E)  polyp.

Question 11

The fluid-filled body cavities of animals function as _______ skeletons.

Accepted Answer

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

Question 12

The man-of-war is an example of a deadly

Accepted Answer

A)  sponge. 
B)  cnidarian. 
C)  ctenophore. 
D)  nematocyst. 
E)  mollusk. 
A)  sponge. 
B)  cnidarian. 
C)  ctenophore. 
D)  nematocyst. 
E)  mollusk.

Question 13

Which of the following statements about sponges is false?

Accepted Answer

A)  Their tissues are not organized into distinct organs. 
B)  The body plan of sponges is an aggregation of cells built around a water canal system. 
C)  They are sessile organisms. 
D)  Sponges reproduce sexually and asexually. 
E)  They are the simplest animals. 
A)  Their tissues are not organized into distinct organs. 
B)  The body plan of sponges is an aggregation of cells built around a water canal system. 
C)  They are sessile organisms. 
D)  Sponges reproduce sexually and asexually. 
E)  They are the simplest animals.

Question 14

Which of the following statements 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 15

_______ symmetry is strongly correlated with cephalization: the development of sense organs and central nervous tissues at the anterior end of an animal.

Accepted Answer

The answer of _______ symmetry is strongly correlated with cephalization:...

Question 16

Which of the following are not eumetazoans?

Accepted Answer

A)  Ctenophores 
B)  Sponges 
C)  Cnidarians 
D)  Bilateria 
E)  Protostomes 
A)  Ctenophores 
B)  Sponges 
C)  Cnidarians 
D)  Bilateria 
E)  Protostomes

Question 17

How do nematocysts help protect some cnidarians?

Accepted Answer

A)  They inject toxins into prey. 
B)  They form a soft shell around the organism. 
C)  They allow the cnidarian to camouflage itself. 
D)  Both a and b 
E)  All of the above 
A)  They inject toxins into prey. 
B)  They form a soft shell around the organism. 
C)  They allow the cnidarian to camouflage itself. 
D)  Both a and b 
E)  All of the above

Question 18

Scyphozoans are abundant, possibly because they

Accepted Answer

A)  can capture large prey and have a low metabolic rate. 
B)  can live in rivers and oceans. 
C)  do not have a sessile stage. 
D)  reproduce asexually. 
E)  Both a and d 
A)  can capture large prey and have a low metabolic rate. 
B)  can live in rivers and oceans. 
C)  do not have a sessile stage. 
D)  reproduce asexually. 
E)  Both a and d

Question 19

Which of the following is the group of animals about which we know the least?

Accepted Answer

A)  Sponges 
B)  Ctenophores 
C)  Placozoans 
D)  Bilateria 
E)  Cnidaria 
A)  Sponges 
B)  Ctenophores 
C)  Placozoans 
D)  Bilateria 
E)  Cnidaria

Question 20

The immature life stage of some organisms before they assume their adult form is called the _______.

Accepted Answer

The answer of The immature life stage of some organisms...

Exam 31: Animal Origins and the Evolution of Body Plans

Which cnidarian group is dominated by species that live symbiotically with photosynthetic protists?

Explain the fundamental difference between protostomes and deuterostomes. What evidence supports dividing organisms into these two clades?

Discuss the two major strategies animals use to get food, and indicate which of these would most likely be used by sessile organisms.

Which of the following feeding strategies is most likely to be associated with a sessile organism?

What is the main difference between a coelom and a pseudocoelom?

Animals that live in or on another organism and obtain nutrients from it are known as _______.

Which of the following statements about ctenophores is true?

Which of the following statements about the symmetry of organisms is false?

Use the following to answer questions : Refer to the diagram below, showing an animal cross-section. -Identify the labeled structures.

The bilaterally symmetrical larval form found in many crustaceans is called a

The fluid-filled body cavities of animals function as _______ skeletons.

The man-of-war is an example of a deadly

Which of the following statements about sponges is false?

Which of the following statements about anthozoans is true?

_______ symmetry is strongly correlated with cephalization: the development of sense organs and central nervous tissues at the anterior end of an animal.

Which of the following are not eumetazoans?

How do nematocysts help protect some cnidarians?

Scyphozoans are abundant, possibly because they

Which of the following is the group of animals about which we know the least?

The immature life stage of some organisms before they assume their adult form is called the _______.

Studying Life

Small Molecules and the Chemistry of Life

Proteins, Carbohydrates, and Lipids

Nucleic Acids and the Origin of Life

Cells: the Working Units of Life

Cell Membranes

Cell Signaling and Communication

Energy, Enzymes, and Metabolism

Pathways That Harvest Chemical Energy

Photosynthesis: Energy From Sunlight

The Cell Cycle and Cell Division

Inheritance, Genes, and Chromosomes

Dna and Its Role in Heredity

From Dna to Protein: Gene Expression

Gene Mutation and Molecular Medicine

Regulation of Gene Expression

Genomes

Recombinent Dna and Biotechnology

Differential Gene Expression in Development

Development and Evolutionary Change

Evidence and Mechanisms of Evolution

Reconstructing and Using Phylogenies

Species and Their Formation

Evolution of Genes and Genomes

The History of Life on Earth

Bacteria and Archaea: the Prokaryotic Domains

The Origin and Diversification of Eukaryotes

Plants Without Seeds: From Water to Land

The Evolution of Seed Plants

Fungi: Recyclers, Pathogens, Parasites, and Plant Partners

Protostome Animals

Deuterostome Animals

The Plant Body

Transport in Plants

Plant Nutrition

Regulation of Plant Growth

Reproduction in Flowering Plants

Plant Responses to Environmental Challenges

Physiology, Homeostasis, and Temperature Regulation

Animal Hormones

Immunology: Animal Defense Systems

Animal Reproduction

Animal Development

Neurons and Nervous Systems

Sensory Systems

The Mammalian Nervous System: Structure and Higher Function

Musculoskeletal Systems

Gas Exchange in Animals

Circulatory Systems

Nutrition, Digestion, and Absorption

Salt and Water Balance and Nitrogen

Animal Behavior

Ecology and the Distribution of Life

Population Ecology

Species Interaction and Coevolution

Community Ecology

Ecosystems and Global Ecology

Conservation Biology

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