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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 24, Problem 2SQ
Textbook Problem
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A body cavity fully lined with tissue derived from mesoderm is called a ______.

  1. a. coelom
  2. b. pseudocoelom
  3. c. complete digestive tract
  4. d. gastrovascular cavity

Summary Introduction

Concept introduction: The gastrula during the embryonic development has three layers. The middle layer is called as mesoderm that gives rise to several organs and tissues depending on the phylum. Coelom is the body cavity observed in animals.

Explanation of Solution

Reasons for the correct statement:

The body plan of most of the animals follows “tube within tube” model. Tube within the tube model refers to the alimentary canal present inside the coelom. The coelom is the body cavity derived from the mesoderm of gastrula during embryonic development in most bilaterally symmetrical animals. The coelom development is conserved throughout the course of evolution of invertebrates. The coelom covers the alimentary canals and protects it from mechanical shocks.

Option a. is given as “coelom”

As coelom is the body cavity of mesodermal origin, option a. is correct.

Reasons for the incorrect statements:

Option b. is given as “pseudocoelom”.

Pseudocoelom is found in the roundworms, and it partially originates from the mesoderm...

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