environment medium MCQ

Which of the following is a common indicator organism for fecal contamination of water?

  1. E. coli
  2. Salmonella
  3. Vibrio cholerae
  4. Streptococcus

Answer: E. coli

E. coli is used as an indicator because its presence suggests recent fecal contamination and potential presence of other pathogens.

Topic Environmental Pollution
Exam Relevance SSC, Railway