Campbell Essential Biology (7th Edition)
Campbell Essential Biology (7th Edition)
7th Edition
ISBN: 9780134765037
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece
Publisher: PEARSON
bartleby

Concept explainers

bartleby

Videos

Textbook Question
Book Icon
Chapter 17, Problem 1SQ

Bilateral symmetry in the animal kingdom is best correlated with

  1. a. an ability to sense equally in all directions.
  2. b. the presence of a skeleton.
  3. c. motility and active predation and escape.
  4. d. development of a body cavity.
Expert Solution & Answer
Check Mark
Summary Introduction

Introduction:

The animals divided the sagittal plane into two equal parts called bilateral symmetrical animals. The plane divides the body into two equal halves, but the inner organs need not be symmetric in the bilaterally symmetrical animals.

Answer to Problem 1SQ

Correct answer:

Bilateral symmetry in the animal kingdom is best correlated with motility and active predation and escape. Therefore, option c. is correct.

Explanation of Solution

Reason for the correct statement:

The bilateral symmetrical animals do have a distinct head end, which is the association of nerve ganglia, mouth, and the sensory organs. The head end helps in the development of the organ called the brain.

The collective working of the head end and the brain lead to the quick responses to the external stimuli, such as threat, food, and others. This benefits the bilateral animals in locomotion, including swimming, walking, crawling, and jumping. The bilateral animals learn to predate other animals using these movements.

Option c. is given as “motility and active predation and escape”.

 “The bilateral symmetry helps the animals in locomotion. The animals can easily predate others by locomotion activities, and can also escape when they are in danger” is the right answer.

Hence, option c. is correct.

Reasons for the incorrect statements:

Option a. is given as “ability to sense equally in all directions”.

The bilateral symmetrical animals can sense more efficiently in the moving direction as compared to other directions. Hence, it is a wrong answer.

Option b. is given as “the presence of a skeleton”.

The flatworms and annelids are included in the bilaterally symmetrical animals, but they lack true skeleton. Hence, it is a wrong answer.

Option d. is given as “development of a body cavity”.

The body cavity is the space that divides the body wall from the digestive tract of an animal. The body cavity does not relate to the bilateral symmetry because the bilateral symmetry defines the two equal halves of the outer body.

Hence, options a., b., and d. are incorrect.

Conclusion

The bilateral symmetrical animals are motile, active predators, and can easily escape from the danger.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Students have asked these similar questions
A characteristic unique to most species of mammals and no other vertebrates isa. endothermy.b. skin covering for insulation and protection from dehydration.c. hair.d. a notochord
One of the innovations in animal body design, segmentation, allowed fora. development of efficient internal organ systems.b. more flexible movement as individual segments can move independently of each other.c. locating organs in different areas of the body.d. early determination of embryonic cells
The function of the amphibian larval stage is to allowa. extended development of the muscular-skeletal system.b. food gathering over an extended period.c. escape from predation.d. prevention of metamorphosis.
Knowledge Booster
Background pattern image
Biology
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
Human Anatomy & Physiology (11th Edition)
Biology
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:PEARSON
Text book image
Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax
Text book image
Anatomy & Physiology
Biology
ISBN:9781259398629
Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa Stouter
Publisher:Mcgraw Hill Education,
Text book image
Molecular Biology of the Cell (Sixth Edition)
Biology
ISBN:9780815344322
Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter Walter
Publisher:W. W. Norton & Company
Text book image
Laboratory Manual For Human Anatomy & Physiology
Biology
ISBN:9781260159363
Author:Martin, Terry R., Prentice-craver, Cynthia
Publisher:McGraw-Hill Publishing Co.
Text book image
Inquiry Into Life (16th Edition)
Biology
ISBN:9781260231700
Author:Sylvia S. Mader, Michael Windelspecht
Publisher:McGraw Hill Education
Animal Adaptations for Kids, Learn about physical, life cycle, and behavioral adaptations of animals; Author: Learn Bright;https://www.youtube.com/watch?v=m2MibjJgyjs;License: Standard youtube license