
Concept explainers
Drinking water utilities monitor their production system for the occurrence of
- a. methanogens.
- b. coliform bacteria.
- c. nematodes.
- d. yeasts.

Introduction:
Indicator organism serves as an indicator for the presence of another organism in a system. In water, indicator organism is used to detect other disease-causing pathogens and bacteria which have a high potential for health hazards.
Answer to Problem 1MCQ
Correct answer:
Drinking water utilities monitor their production system for the occurrence of coliform bacteria. Therefore, option (b) is correct.
Option (b) is given as “coliform bacteria”.
Explanation of Solution
Justify the reason for the correct statement:
Indicator organisms are used to test the water quality. Their presence notifies the possible contamination of the pathogen in water; the presence of coliforms and E.coli specify the fecal and sewage contamination and it also indicates the presence of a pathogen in water. Coliforms and E. coli presence works as an indicator organism in contaminated water.
Hence, option (b) is correct.
Justify the reasons for the incorrect statements:
Option (a) is given as “methanogens”.
Methanogens are used to break down the organic pollutant from the water. They are used in the production of methane. Hence, it is a wrong answer.
Option (c) is given as “nematodes”.
Nematodes are used to remove fecal bacteria from contaminated water. Hence, it is a wrong answer.
Option (d) is given as “yeast”.
Yeast is used to treating the water contaminated with a starch such as vermicelli water. Hence, it is a wrong answer.
Hence, options (a), (c), and (d) are incorrect.
The presence of indicator organism in contaminated water identifies the presence of other disease-causing pathogens.
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Chapter 25 Solutions
Microbiology: A Systems Approach
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