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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 5SQ
Textbook Problem
6 views

______ function(s) in the movement of cnidarians.

  1. a. A hydrostatic skeleton
  2. b. Tube feet
  3. c. Cnidocytes
  4. d. Malpighian tubules

Summary Introduction

Concept introduction: The invertebrates have varied types of organs for locomotion and the lower invertebrates lack any such organs. The cnidarians or the coelenterates are the third phylum. The cnidarians are aquatic and range in size from small microscopic to large-sized animals. The cnidarians lack proper locomotory organs.

Explanation of Solution

Reasons for the correct statement:

The nerve net of the cnidarians send synapses to the contractile cells. The contractile alter the mesoglea or the gastrovascular cavity. The hydrostatic skeleton constitutes the fluid-filled cavity and cellular mass that in turn supports the fluid pressure. This fluid pressure is used up the motile cnidarians for locomotion like jelly fishes. The movement of hydrostatic skeleton is similar to that of water balloon when it is squeezed and released.

Option a. is given as “A hydrostatic skeleton”

As hydrostatic skeleton in the cnidarians helps them in locomotion. Therefore, option a. is correct.

Reasons for the incorrect statements:

Option b. is given as “Tube feet”...

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