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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
Publisher: Cengage Learning
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
Publisher: Cengage Learning
ISBN: 9781305389892
Chapter 27, Problem 6TYK
Textbook Problem
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The greatest contributors to protist fossil deposits, and probable source of oil in many oil deposits, are:

a. Oomycota.

b. Chrysophyta.

c. Bacillariophyta.

d. Sporophyta.

e. Alveolata.

Summary Introduction

Introduction:

Protists are eukaryotes with diversity in metabolism, reproduction, cell structure, habitat and life cycle. They have a true nucleus, cytoplasmic organelles and pellicle layer for protection. They are divided into several phylogenetic groups such as Bacillariophyta, Chrysophyta, Alveolata, and Oomycota.

Explanation of Solution

Explanation for the correct answer:

Option (c) is given that the greatest contributors to protist fossil deposits, and probable source of oil in many oil deposits, are Bacillariophyta. Bacillariophyta (diatoms) are covered by glassy silica shell, two halves of which fit together. These shells accumulate into thick layers of sediments and thus acts as major contributors to fossil deposits. Also, diatoms can store food in the form of oil; thus, forming a source of oil deposits. Hence, option (c) is correct.

Explanation for the incorrect answer:

Option (a) is given that the greatest contributors to protist fossil deposits, and probable source of oil in many oil deposits, are Oomycota. Oomycota lacks chloroplasts and secretes enzymes for digestion of complex molecules. Thus, they contribute in breaking down of complex surrounding molecules into simpler substances hence, cannot be the source of fossil or oil deposits. So, it is an incorrect option.

Option (b) is given that the greatest contributors to protist fossil deposits, and probable source of oil in many oil deposits, are Chrysophyta...

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