Textbook Question
A land snail, a clam, and an octopus all share
a. A mantle
b. A radula
c. Gills
d. Distinct cephalization
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Ch. 33 - An introduction to Invertebrates
Urry11th EditionCampbell BiologyISBN: 9789357423311
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Table of contents
- Ch. 1 - Evolution, the Themes of Biology, and Scientific Inquiry8
- Ch. 2 - The Chemical Context of Life8
- Ch. 3 - Water and Life6
- Ch. 4 - Carbon and the Molecular Diversity of Life9
- Ch. 5 - The Structure and Function of Large Biological Molecules9
- Ch. 6 - A Tour of the Cell6
- Ch. 7 - Membrane Structure and Function6
- Ch. 8 - An Introduction to Metabolism6
- Ch. 9 - Cellular Respiration and Fermentation10
- Ch. 10 - Photosynthesis7
- Ch. 11 - Cell Communication7
- Ch. 12 - The Cell Cycle10
- Ch. 13 - Meiosis and Sexual Life Cycles10
- Ch. 14 - Mendel and the Gene Idea14
- Ch, 15 - The Chromosomal Basis of Inheritance7
- Ch. 16 - The Molecular Basis of Inheritance9
- Ch. 17 - Gene Expression: From Gene to Protein9
- Ch. 18 - Regulation of Gene Expression10
- Ch. 19 - Viruses6
- Ch. 20 - DNA Tools and Biotechnology8
- Ch. 21 - Genomes and Their Evolution8
- Ch. 22 - Descent with Modification: A Darwininan View of Life6
- Ch. 23 - The Evolution of Populations5
- Ch. 24 - The Origin of Species6
- Ch. 25 - The History of Life on Earth6
- Ch. 26 - Phylogeny and the Tree of Life7
- Ch. 27 - Bacteria and Archaea8
- Ch. 28 - Protists7
- Ch. 29 - Plant Diversity I: How Plants Colonized Land7
- Ch. 30 - Plant Diversity II: The Evolution of Seed Plants7
- Ch. 31 - Fungi5
- Ch. 32 - An Overview of Animal Diversity4
- Ch. 33 - An introduction to Invertebrates6
- Ch. 34 - The Origin and Evolution of Vertebrates7
- Ch. 35 - Vascular Plant Structure, Growth, and Development8
- Ch. 36 - Resource Acquisition and Transport in Vascular Plants8
- Ch. 37 - Soil and Plant Nutrition10
- Ch. 38 - Angiosperm Reproduction and Biotechnology8
- Ch. 39 - Plant Responses to Internal and External Signals8
- Ch. 40 - Basic Principles of Animal Form and Function8
- Ch. 41 - Animal Nutrition7
- Ch. 42 - Circulation and Gas Exchange7
- Ch. 43 - The Immune System6
- Ch. 44 - Osmoregulation and Excretion6
- Ch. 45 - Hormones and the Endocrine System8
- Ch. 46 - Animal Reproduction8
- Ch. 47 - Animal Development8
- Ch. 48 - Neurons, Synapses, and Signaling6
- Ch. 49 - Nervous Systems8
- Ch. 50 - Sensory and Motor Mechanisms5
- Ch. 51 Animal Behavior6
- Ch. 52 - An Introduction to Ecology and the Biosphere7
- Ch. 53 - Population Ecology10
- Ch. 54 - Community Ecology9
- Ch. 55 - Ecosystems and Restoration Ecology8
- Ch. 56 - Conservation Biology and Global Change6
Chapter 33, Problem 4
Which of the following combinations of phylum and description is incorrect?
a. Echinodermata—bilateral symmetry as a larva, coelomate
b. Nematoda—roundworms, pseudocoelomate
c. Platyhelminthes—flatworms, gastrovascular cavity, acoelomate
d. Porifera—gastrovascular cavity, coelomate
Verified step by step guidance1
Understand the characteristics of each phylum mentioned in the options. This will help in identifying which description does not match the phylum.
Review the characteristics of Echinodermata. They are known for having bilateral symmetry as larvae and being coelomates, meaning they have a true coelom.
Examine the characteristics of Nematoda. These are roundworms and are pseudocoelomates, meaning they have a body cavity that is not completely lined by mesoderm.
Consider the characteristics of Platyhelminthes. These are flatworms, typically having a gastrovascular cavity and being acoelomates, meaning they lack a true coelom.
Analyze the characteristics of Porifera. They are sponges and do not have a gastrovascular cavity or a true coelom, which makes this combination incorrect.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Phylum Echinodermata
Echinodermata is a phylum of marine animals known for their radial symmetry in adulthood and bilateral symmetry as larvae. They are coelomates, meaning they have a true body cavity lined with mesoderm. Examples include starfish and sea urchins.
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Lophotrochozoans
Phylum Porifera
Porifera, commonly known as sponges, are simple aquatic animals characterized by a porous body and lack of true tissues and organs. They do not possess a gastrovascular cavity or a coelom, as they have a simple body plan with a system of canals and chambers for water flow.
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Body Cavities: Coelomate, Pseudocoelomate, Acoelomate
Body cavities are classified based on the presence and type of cavity. Coelomates have a true coelom lined with mesoderm, pseudocoelomates have a cavity not fully lined with mesoderm, and acoelomates lack a body cavity. These classifications help in understanding the complexity and organization of different animal phyla.
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Related Practice
Textbook Question
Which phylum is characterized by animals that have a segmented body?
a. Cnidaria
b. Platyhelminthes
c. Arthropoda
d. Mollusca
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Textbook Question
The water vascular system of echinoderms
a. Functions as a circulatory system that distributes nutrients to body cells
b. Functions in locomotion and feeding
c. Is bilateral in organization, even though the adult animal is not bilaterally symmetrical
d. Moves water through the animal's body during filter feeding
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Textbook Question
In the following figure, which two main clades branch from the most recent common ancestor of the eumetazoans?
a. Porifera and Cnidaria
b. Lophotrochozoa and Ecdysozoa
c. Cnidaria and Bilateria
d. Deuterostomia and Bilateria
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Textbook Question
In Figure 33.7, assume that the two medusae shown at step 4 were produced by one polyp colony. Review Concept 12.1 and Concept 13.3, and then use your understanding of mitosis and meiosis to evaluate whether the following sentence is true or false; if false, select the answer that provides the correct reason. Although the two medusae are genetically identical, a sperm produced by one will differ genetically from an egg produced by the other.
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a. Both the medusae and the gametes are genetically identical.
b. Neither the medusae nor the gametes are genetically identical.
c. The medusae are not genetically identical, but the gametes are genetically identical.
d. The medusae are genetically identical, but the gametes differ genetically.
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