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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 20, Problem 8SQ
Textbook Problem
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Bacteria that serve as decomposers are ___ .

  1. a. photoautotrophs
  2. b. photoheterotrophs
  3. c. chemoautotrophs
  4. d. chemoheterotrophs

Summary Introduction

Introduction: According to the energy pathway, the organisms are classified as autotrophs and heterotrophs. Autotrophs are capable of making energy by utilizing the inorganic substances with the help of energy sources like sunlight (plants). The organisms that feed on others in the form of carbohydrates, proteins, and fats are called as heterotrophs.

Explanation of Solution

Reason for correct answer:

Chemoheterotrophs are the heterotrophs that use chemical energy but needs to feed on others for their survival. Bacteria are the decomposers that utilize the dead decay matter as their carbon source and gains energy through chemicals.

Hence, the bacteria are the chemoheterotrophs, as they utilize the dead matter and can also utilize the chemical energy for their survival.

Option d. is given as “chemoheterotrophs”. The heterotrophs are the organisms that cannot make their own food using CO2 and depends on the oxidizing other molecules for obtaining energy that can feed both on the living things and utilize the chemical energy as the carbon source.  So, bacteria get energy by oxidizing the dead and decay matter.

Hence, the correct answer is option d.

Reasons for incorrect answer:

Option a. is given as “photoautotrophs”. Photoautotrophs are autotrophs that use light energy (sunlight) for making their own food. Plants are the example for photoautotrophs...

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