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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 25, Problem 4SQ
Textbook Problem
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Both cartilaginous and bony fishes have ___ .

  1. a. jaws
  2. b. a bony skeleton
  3. c. lungs
  4. d. a swim bladder
  5. e. a four-chambered heart
  6. f. all of the above

Summary Introduction

Concept introduction: Jawed vertebrates are those chordates that have jaw bones which perform the function of capturing prey and consuming food. The Class: Pisces includes animals that first evolved the jaw bones. The Pisces includes cartilaginous and bony fishes.

Explanation of Solution

Reasons for the correct statement:

The cartilaginous and bony fishes under the Subphylum: Pisces have jaws. The jaws help these fishes to capture their prey and consume food. The jaw is the only common characteristics of both the type of fishes. Though, both the type of fishes possess jaws, the nature of substance the jaws are made of varies.

Option a. is given as “jaws”

Since cartilaginous and bony fishes have the common feature, the jaws, option a. is correct.

Reasons for the incorrect statements:

Option b. is given as “a bony skeleton”.

Only the bony fishes are made of bony skeleton and the cartilaginous fishes are made of cartilaginous skeleton. Hence, option b. is incorrect.

Option c. is given as “lungs”.

The lung is the organ where gaseous exchange takes place. Lungs are present in bony fishes. In cartilaginous fishes, lungs are absent instead they have gills where gaseous exchange takes place...

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