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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 5SQ
Textbook Problem
66 views

Diatoms produce _______ that help(s) them float.

  1. a. phycobilins
  2. b. oils
  3. c. diatomaceous earth
  4. d. alginates

Summary Introduction

Concept introduction: Diatoms are protists that are enclosed within a cell wall made of silica. Diatoms are found in all possible habitat and they are commonly found in fresh water, sea water and soils. Most of the members of the diatoms contain raphe and they carry out the gliding movement.

Explanation of Solution

Reasons for the correct statement:

The cells of diatoms contain a large amount of oils. Compare to water, oil is less dense and their presence in the photosynthetic cells helps them to float in sunlit water.

Option b. is given as “oils”. As the diatoms produce oils that helps them to float option b. is correct.

Reasons for the incorrect statements:

Option a. is given as “phycobilins”.

Phycobilins are water soluble pigments which are found only in Cyanobacteria and Rhodophyta...

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