All sponges belong to a phylum called Porifera. They are the simplest animals with cellular level of organization. They have diverged from other animals early in the evolution. They have a very simple body structure composed of only two layers of cells. In between the two layers, a gelatinous region is present called mesohyl. The exchange of nutrient and waste material takes place through diffusion in sponges.

Question

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Answer 1

Question

Chapter 31, Problem 1TYU

Summary Introduction

Introduction: All sponges belong to a phylum called Porifera. They are the simplest animals with cellular level of organization. They have diverged from other animals early in the evolution. They have a very simple body structure composed of only two layers of cells. In between the two layers, a gelatinous region is present called mesohyl. The exchange of nutrient and waste material takes place through diffusion in sponges.

Expert Solution & Answer

Answer to Problem 1TYU

Correct answer: Collar cells (chaonocytes) are characteristics of poriferans. Hence, the correct answer is option (a).

Explanation of Solution

Reason for the correct answer:

Option (a) is given as “poriferans”. The interior space of the body of poriferans is characterized by numerous canals lined with flagellate choanocytes. These cells help to capture food particles. They generate water flow through the body of the sponges. Hence, the correct answer is option (a).

Reasons for the incorrect answers:

Option (b) is given as “cnidarians”. Cnidarians are characterized by cnidocytes. Hence, option (b) is incorrect.

Option (c) is given as “most celomates”. Collar cells are characteristics of acelomate that is in poriferans. Hence, option (c) is incorrect.

Option (d) is given as, “lophotrochozoans”. Collar cells (chaonocytes) are not the characteristics of lophotrochozoans. Hence, option (d) is incorrect.

Option (e) is given as “ecdysozoans”. Ecdysozoans lack collar cells. Hence, option (e) is incorrect.

Hence, options (b), (c), (d), and (e) are incorrect.

Conclusion

Cnidarians are characterized by the presence of collar cells.

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Students have asked these similar questions

Which of the following combinations of phylum anddescription 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

In Figure 33.2, which two main clades branch from the mostrecent common ancestor of the eumetazoans?(A) Porifera and Cnidaria(B) Lophotrochozoa and Ecdysozoa(C) Cnidaria and Bilateria(D) Deuterostomia and Bilateria

The distinction between sponges and other animal phyla is based mainly on the absence versus the presence of (A) a body cavity. (B) a complete digestive tract. (C) mesoderm. (D) tissues.

Answer 2

Question

Chapter 31, Problem 1TYU

Summary Introduction

Introduction: All sponges belong to a phylum called Porifera. They are the simplest animals with cellular level of organization. They have diverged from other animals early in the evolution. They have a very simple body structure composed of only two layers of cells. In between the two layers, a gelatinous region is present called mesohyl. The exchange of nutrient and waste material takes place through diffusion in sponges.

Expert Solution & Answer

Answer to Problem 1TYU

Correct answer: Collar cells (chaonocytes) are characteristics of poriferans. Hence, the correct answer is option (a).

Explanation of Solution

Reason for the correct answer:

Option (a) is given as “poriferans”. The interior space of the body of poriferans is characterized by numerous canals lined with flagellate choanocytes. These cells help to capture food particles. They generate water flow through the body of the sponges. Hence, the correct answer is option (a).

Reasons for the incorrect answers:

Option (b) is given as “cnidarians”. Cnidarians are characterized by cnidocytes. Hence, option (b) is incorrect.

Option (c) is given as “most celomates”. Collar cells are characteristics of acelomate that is in poriferans. Hence, option (c) is incorrect.

Option (d) is given as, “lophotrochozoans”. Collar cells (chaonocytes) are not the characteristics of lophotrochozoans. Hence, option (d) is incorrect.

Option (e) is given as “ecdysozoans”. Ecdysozoans lack collar cells. Hence, option (e) is incorrect.

Hence, options (b), (c), (d), and (e) are incorrect.

Conclusion

Cnidarians are characterized by the presence of collar cells.

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Answer 3

Question

Chapter 31, Problem 1TYU

Summary Introduction

Introduction: All sponges belong to a phylum called Porifera. They are the simplest animals with cellular level of organization. They have diverged from other animals early in the evolution. They have a very simple body structure composed of only two layers of cells. In between the two layers, a gelatinous region is present called mesohyl. The exchange of nutrient and waste material takes place through diffusion in sponges.

Expert Solution & Answer

Answer to Problem 1TYU

Correct answer: Collar cells (chaonocytes) are characteristics of poriferans. Hence, the correct answer is option (a).

Explanation of Solution

Reason for the correct answer:

Option (a) is given as “poriferans”. The interior space of the body of poriferans is characterized by numerous canals lined with flagellate choanocytes. These cells help to capture food particles. They generate water flow through the body of the sponges. Hence, the correct answer is option (a).

Reasons for the incorrect answers:

Option (b) is given as “cnidarians”. Cnidarians are characterized by cnidocytes. Hence, option (b) is incorrect.

Option (c) is given as “most celomates”. Collar cells are characteristics of acelomate that is in poriferans. Hence, option (c) is incorrect.

Option (d) is given as, “lophotrochozoans”. Collar cells (chaonocytes) are not the characteristics of lophotrochozoans. Hence, option (d) is incorrect.

Option (e) is given as “ecdysozoans”. Ecdysozoans lack collar cells. Hence, option (e) is incorrect.

Hence, options (b), (c), (d), and (e) are incorrect.

Conclusion

Cnidarians are characterized by the presence of collar cells.

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Answer 4

Question

Chapter 31, Problem 1TYU

Summary Introduction

Introduction: All sponges belong to a phylum called Porifera. They are the simplest animals with cellular level of organization. They have diverged from other animals early in the evolution. They have a very simple body structure composed of only two layers of cells. In between the two layers, a gelatinous region is present called mesohyl. The exchange of nutrient and waste material takes place through diffusion in sponges.

Expert Solution & Answer

Answer to Problem 1TYU

Correct answer: Collar cells (chaonocytes) are characteristics of poriferans. Hence, the correct answer is option (a).

Explanation of Solution

Reason for the correct answer:

Option (a) is given as “poriferans”. The interior space of the body of poriferans is characterized by numerous canals lined with flagellate choanocytes. These cells help to capture food particles. They generate water flow through the body of the sponges. Hence, the correct answer is option (a).

Reasons for the incorrect answers:

Option (b) is given as “cnidarians”. Cnidarians are characterized by cnidocytes. Hence, option (b) is incorrect.

Option (c) is given as “most celomates”. Collar cells are characteristics of acelomate that is in poriferans. Hence, option (c) is incorrect.

Option (d) is given as, “lophotrochozoans”. Collar cells (chaonocytes) are not the characteristics of lophotrochozoans. Hence, option (d) is incorrect.

Option (e) is given as “ecdysozoans”. Ecdysozoans lack collar cells. Hence, option (e) is incorrect.

Hence, options (b), (c), (d), and (e) are incorrect.

Conclusion

Cnidarians are characterized by the presence of collar cells.

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Answer 5

Chapter 31, Problem 1TYU

Summary Introduction

Introduction: All sponges belong to a phylum called Porifera. They are the simplest animals with cellular level of organization. They have diverged from other animals early in the evolution. They have a very simple body structure composed of only two layers of cells. In between the two layers, a gelatinous region is present called mesohyl. The exchange of nutrient and waste material takes place through diffusion in sponges.

Expert Solution & Answer

Answer to Problem 1TYU

Correct answer: Collar cells (chaonocytes) are characteristics of poriferans. Hence, the correct answer is option (a).

Explanation of Solution

Reason for the correct answer:

Option (a) is given as “poriferans”. The interior space of the body of poriferans is characterized by numerous canals lined with flagellate choanocytes. These cells help to capture food particles. They generate water flow through the body of the sponges. Hence, the correct answer is option (a).

Reasons for the incorrect answers:

Option (b) is given as “cnidarians”. Cnidarians are characterized by cnidocytes. Hence, option (b) is incorrect.

Option (c) is given as “most celomates”. Collar cells are characteristics of acelomate that is in poriferans. Hence, option (c) is incorrect.

Option (d) is given as, “lophotrochozoans”. Collar cells (chaonocytes) are not the characteristics of lophotrochozoans. Hence, option (d) is incorrect.

Option (e) is given as “ecdysozoans”. Ecdysozoans lack collar cells. Hence, option (e) is incorrect.

Hence, options (b), (c), (d), and (e) are incorrect.

Conclusion

Cnidarians are characterized by the presence of collar cells.

Answer 6

Chapter 31, Problem 1TYU

Summary Introduction

Introduction: All sponges belong to a phylum called Porifera. They are the simplest animals with cellular level of organization. They have diverged from other animals early in the evolution. They have a very simple body structure composed of only two layers of cells. In between the two layers, a gelatinous region is present called mesohyl. The exchange of nutrient and waste material takes place through diffusion in sponges.

Expert Solution & Answer

Answer to Problem 1TYU

Correct answer: Collar cells (chaonocytes) are characteristics of poriferans. Hence, the correct answer is option (a).

Explanation of Solution

Reason for the correct answer:

Option (a) is given as “poriferans”. The interior space of the body of poriferans is characterized by numerous canals lined with flagellate choanocytes. These cells help to capture food particles. They generate water flow through the body of the sponges. Hence, the correct answer is option (a).

Reasons for the incorrect answers:

Option (b) is given as “cnidarians”. Cnidarians are characterized by cnidocytes. Hence, option (b) is incorrect.

Option (c) is given as “most celomates”. Collar cells are characteristics of acelomate that is in poriferans. Hence, option (c) is incorrect.

Option (d) is given as, “lophotrochozoans”. Collar cells (chaonocytes) are not the characteristics of lophotrochozoans. Hence, option (d) is incorrect.

Option (e) is given as “ecdysozoans”. Ecdysozoans lack collar cells. Hence, option (e) is incorrect.

Hence, options (b), (c), (d), and (e) are incorrect.

Conclusion

Cnidarians are characterized by the presence of collar cells.

Answer 7

Chapter 31, Problem 1TYU

Summary Introduction

Introduction: All sponges belong to a phylum called Porifera. They are the simplest animals with cellular level of organization. They have diverged from other animals early in the evolution. They have a very simple body structure composed of only two layers of cells. In between the two layers, a gelatinous region is present called mesohyl. The exchange of nutrient and waste material takes place through diffusion in sponges.

Answer 8

Expert Solution & Answer

Answer to Problem 1TYU

Correct answer: Collar cells (chaonocytes) are characteristics of poriferans. Hence, the correct answer is option (a).

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Explanation of Solution

Reason for the correct answer:

Option (a) is given as “poriferans”. The interior space of the body of poriferans is characterized by numerous canals lined with flagellate choanocytes. These cells help to capture food particles. They generate water flow through the body of the sponges. Hence, the correct answer is option (a).

Reasons for the incorrect answers:

Option (b) is given as “cnidarians”. Cnidarians are characterized by cnidocytes. Hence, option (b) is incorrect.

Option (c) is given as “most celomates”. Collar cells are characteristics of acelomate that is in poriferans. Hence, option (c) is incorrect.

Option (d) is given as, “lophotrochozoans”. Collar cells (chaonocytes) are not the characteristics of lophotrochozoans. Hence, option (d) is incorrect.

Option (e) is given as “ecdysozoans”. Ecdysozoans lack collar cells. Hence, option (e) is incorrect.

Hence, options (b), (c), (d), and (e) are incorrect.

Answer 12

Conclusion

Cnidarians are characterized by the presence of collar cells.

Answer 13

Ch. 31.1 - Prob. 1LO Ch. 31.1 - Prob. 2LO Ch. 31.1 - Prob. 3LO Ch. 31.1 - connect What is the significance of choanocytes in...Ch. 31.1 - Prob. 2C Ch. 31.1 - VISUALIZE Sketch the major events of the life...Ch. 31.1 - Prob. 4C Ch. 31.2 - Prob. 4LO Ch. 31.2 - Prob. 5LO Ch. 31.2 - Prob. 6LO

Concept explainers

Answer to Problem 1TYU

Explanation of Solution

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Chapter 31 Solutions