EBK BIOLOGY
EBK BIOLOGY
11th Edition
ISBN: 8220101459800
Author: Byers
Publisher: PEARSON
bartleby

Concept explainers

bartleby

Videos

Textbook Question
Book Icon
Chapter 24, Problem 1MC

Which of the following groups contains radially symmetrical organisms?

  1. arthropods

  2. cnidarians

  3. mollusks

  4. roundworms

Expert Solution & Answer
Check Mark
Summary Introduction

Introduction:

Body symmetry was not evident in the earlier eukaryotes. It is noted down when tissues were developed in the animals. There are various types of body symmetry. In radial body symmetry, any plane going through the central axis divides the organism into equal halves. In bilateral symmetry, animals can be divided into almost mirror-image halves only among one particular plane through central axis.

Answer to Problem 1MC

Correct answer:

Radially symmetrical organisms are found in cnidarians group among the given groups.

Explanation of Solution

Explanation for the correct answer:

Option (b) is given that radially symmetrical organisms are found in cnidarians. The body plan of cnidarians is unique as any plane passing through their central axis divides these animals into equal halves. This property makes cnidarians different from the organisms evolved before them. Hence, option (b) is a correct answer.

Explanation for incorrect answers:

Option (a) is given that radially symmetrical organisms are found in arthropods. Arthropods are bilaterally symmetrical organisms as there is only one plane that passes through the central axis that can divide them into mirror-image halves. So, it is an incorrect option.

Option (c) is given that radially symmetrical organisms are found in molluscs. Molluscs are bilaterally symmetrical organisms as there is only one plane that passes through the central axis that can divide them into mirror-image halves. So, it is an incorrect option.

Option (d) is given that roundworm possesses radial symmetry. Roundworms are bilaterally symmetrical organisms as there is only one plane that passes through the central axis that can divide them into mirror-image halves. So, it is an incorrect option.

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

Conclusion

Therefore, it can be concluded that from the given groups, radially symmetrical organisms are found in cnidarians.

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
10. Your instructor will give you 2 amino acids during the activity session (video 2-7. A. First color all the polar and non-polar covalent bonds in the R groups of your 2 amino acids using the same colors as in #7. Do not color the bonds in the backbone of each amino acid. B. Next, color where all the hydrogen bonds, hydrophobic interactions and ionic bonds could occur in the R group of each amino acid. Use the same colors as in #7. Do not color the bonds in the backbone of each amino acid. C. Position the two amino acids on the page below in an orientation where the two R groups could bond together. Once you are satisfied, staple or tape the amino acids in place and label the bond that you formed between the two R groups. - Polar covalent Bond - Red - Non polar Covalent boND- yellow - Ionic BonD - PINK Hydrogen Bonn - Purple Hydrophobic interaction-green O=C-N H I. H HO H =O CH2 C-C-N HICK H HO H CH2 OH H₂N C = O
Find the dental formula and enter it in the following format: I3/3 C1/1 P4/4 M2/3 = 42 (this is not the correct number, just the correct format) Please be aware: the upper jaw is intact (all teeth are present). The bottom jaw/mandible is not intact. The front teeth should include 6 total rectangular teeth (3 on each side) and 2 total large triangular teeth (1 on each side).
12. Calculate the area of a circle which has a radius of 1200 μm. Give your answer in mm² in scientific notation with the correct number of significant figures.
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
Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax
Text book image
Concepts of Biology
Biology
ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:OpenStax College
Text book image
Biology: The Unity and Diversity of Life (MindTap...
Biology
ISBN:9781305073951
Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher:Cengage Learning
Text book image
Biology Today and Tomorrow without Physiology (Mi...
Biology
ISBN:9781305117396
Author:Cecie Starr, Christine Evers, Lisa Starr
Publisher:Cengage Learning
Text book image
Biology: The Dynamic Science (MindTap Course List)
Biology
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Cengage Learning
Text book image
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Biology
ISBN:9781305967359
Author:STARR
Publisher:CENGAGE L
Phylogeny and the Tree of Life; Author: Professor Dave Explains;https://www.youtube.com/watch?v=KLMn4XwS8Tw;License: Standard YouTube License, CC-BY