Which of the following are true about coliform bacteria ? A. They are used to…
2025
Which of the following are true about coliform bacteria ?
A. They are used to test water contamination.
B. Coliform bacteria are harmless and cause no disease.
C. They are found naturally in human intestinal tract.
D. Their presence in water is an indication of fecal contamination.
Choose the most appropriate answer from the options given below:
- A.
A and D Only
- B.
B and C Only
- C.
A, C and D Only
- D.
A, B, C and D
Attempted by 22 students.
Show answer & explanation
Correct answer: D
Correct selection: They are used to test water contamination; they are found naturally in the human intestinal tract; and their presence in water indicates fecal contamination.
They are used to test water contamination — coliforms serve as indicator organisms for the sanitary quality of water because their presence suggests possible contamination pathways.
They are found naturally in the human intestinal tract — many coliforms (for example, Escherichia coli) are normal gut inhabitants.
Their presence in water is an indication of fecal contamination — detecting coliforms in water suggests that fecal material may have entered the water supply, which raises the risk of enteric pathogens.
coliform bacteria are harmless and cause no disease is an overgeneralization is also true .
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