BIOLOGY:CONCEPTS+INV>CUSTOM<
BIOLOGY:CONCEPTS+INV>CUSTOM<
18th Edition
ISBN: 9781307311655
Author: Hoefnagels
Publisher: MCG/CREATE
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Textbook Question
Chapter 21, Problem 1MCQ

Following gastrulation, the cells that have folded inward develop into

  1. a. endoderm.
  2. b. mesoderm.
  3. c. ectoderm.
  4. d. All of the above are correct.
Expert Solution & Answer
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Summary Introduction

Introduction:

Gastrulation is a period in the development of an embryo of animals, in which a single layered blastula folds itself in such a way that it forms a cup shaped structure called gastrula. Gastrula further contains two or three layers of tissue. It includes the endoderm, ectoderm and mesoderm.

Answer to Problem 1MCQ

Correct answer:

The cells that have folded inward develop into endoderm, after gone through the gastrulation phase. Therefore, option (a) is correct.

Explanation of Solution

Reason for the correct statement:

The blastula rearranges itself to develop the gastrula, following gastrulation the cells that fold inward develop into the endoderm. Endoderm is the inner most layer which contributes to the development of an embryo

Option (a) is given as “endoderm”.

As, “endoderm is the inner most layer which is formed by the folding of cells after gastrulation phase. Endoderm is the primary germ layer which contributes to the development of an embryo in early stage”, it is the right answer.

Hence, option (a) is correct.

Reasons for the incorrect statements:

Option (b), is given as “mesoderm”.

Mesoderm is the middle layer formed between ectoderm and endoderm. This is the third primary germ layer which also contributes to the development of an embryo. Mesoderm is formed by the interaction of two germ layers including ectoderm and endoderm. Hence, it is a wrong answer.

Option (c), is given as “ectoderm”.

Ectoderm is the outermost germ layer that also forms during the development of an embryo. It covers the outside of the embryo. Hence, it is a wrong answer.

Option (d), is given as “all of the above are correct”.

Endoderm, ectoderm and mesoderm all are the primary germ layers which are formed during the development of an embryo. Ectoderm is the outer layer of tissue and mesoderm is the inner layer of tissue. The cells that have folded inward result in the formation of endoderm. Hence, it is a wrong answer.

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

Conclusion

Endoderm is formed by the inward folding of cells followed after gastrulation. Endoderm is the primary germ layer which contributes to the development of an embryo in the early stage.

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Chapter 21 Solutions

BIOLOGY:CONCEPTS+INV>CUSTOM<

Ch. 21.2 - Prob. 4MCCh. 21.3 - Prob. 1MCCh. 21.3 - Prob. 2MCCh. 21.3 - Prob. 3MCCh. 21.3 - Prob. 4MCCh. 21.4 - Prob. 1MCCh. 21.4 - Prob. 2MCCh. 21.4 - Prob. 3MCCh. 21.5 - Prob. 1MCCh. 21.5 - Prob. 2MCCh. 21.5 - Prob. 3MCCh. 21.5 - Prob. 4MCCh. 21.6 - What defining feature arose in the annelid lineage...Ch. 21.6 - Prob. 2MCCh. 21.6 - Prob. 3MCCh. 21.6 - Prob. 4MCCh. 21.6 - Prob. 5MCCh. 21.7 - Prob. 1MCCh. 21.7 - Prob. 2MCCh. 21.7 - Prob. 3MCCh. 21.7 - Prob. 4MCCh. 21.7 - Prob. 5MCCh. 21.8 - Prob. 1MCCh. 21.8 - Prob. 2MCCh. 21.8 - Prob. 3MCCh. 21.8 - Prob. 4MCCh. 21.8 - What are the advantages and disadvantages of an...Ch. 21.8 - Prob. 6MCCh. 21.8 - Prob. 7MCCh. 21.8 - Prob. 8MCCh. 21.9 - Prob. 1MCCh. 21.9 - Prob. 2MCCh. 21.9 - What are some examples of echinoderms?Ch. 21.9 - Prob. 4MCCh. 21.10 - What are four key defining characteristics of...Ch. 21.10 - Prob. 2MCCh. 21.10 - Prob. 3MCCh. 21.10 - Prob. 4MCCh. 21.10 - Differentiate between an ectotherm and an...Ch. 21.10 - How does the number of heart chambers affect the...Ch. 21.11 - Compare and contrast the features of tunicates and...Ch. 21.11 - Prob. 2MCCh. 21.11 - Prob. 3MCCh. 21.12 - Prob. 1MCCh. 21.12 - Prob. 2MCCh. 21.13 - Prob. 1MCCh. 21.13 - Prob. 2MCCh. 21.13 - Prob. 3MCCh. 21.14 - Prob. 1MCCh. 21.14 - Prob. 2MCCh. 21.14 - What features distinguish the three orders of...Ch. 21.15 - Prob. 1MCCh. 21.15 - Prob. 2MCCh. 21.15 - Prob. 3MCCh. 21.15 - Prob. 4MCCh. 21.15 - Prob. 5MCCh. 21.15 - Prob. 6MCCh. 21.16 - Prob. 1MCCh. 21.16 - Prob. 2MCCh. 21.16 - Prob. 3MCCh. 21.17 - Prob. 1MCCh. 21.17 - Prob. 2MCCh. 21 - Following gastrulation, the cells that have folded...Ch. 21 - Prob. 2MCQCh. 21 - How is the body structure of an annelid different...Ch. 21 - Prob. 4MCQCh. 21 - Prob. 5MCQCh. 21 - Prob. 6MCQCh. 21 - Prob. 7MCQCh. 21 - Prob. 8MCQCh. 21 - Prob. 9MCQCh. 21 - Since a tunicate is considered to be a chordate,...Ch. 21 - Prob. 11MCQCh. 21 - Prob. 12MCQCh. 21 - How do reptiles and mammals differ from...Ch. 21 - Prob. 14MCQCh. 21 - Since a whale is a mammal, it must a. have scales....Ch. 21 - Compare the nine major animal phyla in the order...Ch. 21 - Prob. 2WIOCh. 21 - Prob. 3WIOCh. 21 - Distinguish between (a) radial and bilateral...Ch. 21 - Prob. 5WIOCh. 21 - Like sponges, plants tire sessile organisms, but...Ch. 21 - Prob. 7WIOCh. 21 - Prob. 8WIOCh. 21 - Compare and contrast the roundworm body structure...Ch. 21 - Make a chart showing the characteristics of each...Ch. 21 - List the features that determine the echinoderms...Ch. 21 - Prob. 12WIOCh. 21 - How do tunicates and lancelets differ from fishes...Ch. 21 - Draw from memory a phylogenetic tree that traces...Ch. 21 - Prob. 15WIOCh. 21 - List five adaptations that enable (a) fishes to...Ch. 21 - Prob. 17WIOCh. 21 - Prob. 18WIOCh. 21 - Summarize the evidence for the idea that birds are...Ch. 21 - Prob. 20WIOCh. 21 - Prob. 21WIOCh. 21 - Prob. 22WIOCh. 21 - How are fishes, amphibians, nonavian reptiles,...Ch. 21 - Give three examples of interactions between...Ch. 21 - Prob. 25WIOCh. 21 - Prob. 26WIOCh. 21 - Invasive animal species are disrupting ecosystems...Ch. 21 - Prob. 1PITCh. 21 - Prob. 2PITCh. 21 - 3. Draw a concept map that summarizes the...

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