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Biology: The Unity and Diversity o...

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

Solutions

Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 24, Problem 13SQ
Textbook Problem
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The ______ and _______ are grouped as Ecdysozoa because they both molt.

  1. a. cnidarians / arthropods
  2. b. echinoderms / flatworms
  3. c. annelids / mollusks
  4. d. insects/roundworms

Summary Introduction

Concept introduction: Ecdysozoans are invertebrates that molt. Molting refers to shedding followed by renewal of body parts as a part of growth process. Molting is also known as ecdysis and the hormones involves in molting are known as ecdysones.

Explanation of Solution

Reasons for correct statement:

The roundworms and the insects are grouped under the protostomes Clade: Ecdysozoa. The roundworms molt the collagen-rich cuticle that covers their body as they grow. The caterpillars of the Order: Lepidoptera molt and then form the pupa. The insect larval stages generally molt several times to undergo the complete metamorphosis.

 Option d. is given as “insects/roundworms”

As roundworms and insects molt their exoskeleton to grow in size, option d. is correct.

Reasons for the incorrect statements:

Option a. is given as “cnidarians/arthropods”...

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