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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 21, Problem 3SQ
Textbook Problem
15 views

Radiolaria and diatoms have a shell of _______.

  1. a. cellulose
  2. b. silica
  3. c. calcium carbonate
  4. d. chitin

Summary Introduction

Concept introduction: The shell of diatoms consists of two overlapping parts that fit one within the other. When the diatoms die, their shells will accumulate on the seafloor. Radiolaria are most abundantly found in nutrient-rich tropical water.

Explanation of Solution

Reasons for the correct statement:

Diatoms are diploid, photosynthetic protists which have the ability to secrete a protective silica shell. Radiolarians are single-celled heterotrophic protists that have a porous silica shell.

Option b. is given as “silica”. As silica shell is present in both radiolaria and diatoms, option b. is correct.

Reasons for the incorrect statements:

Option a. is given as “cellulose”.

The shell of diatoms and radiolarian is not made up of cellulose...

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