Multiple choice

High coliform counts in water is an indication of ___________.

  1. phosphorus contamination

  2. decreased biological oxygen demand

  3. contamination by human wastes

  4. mercury contamination
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the test of water contamination, the number of the colonies of coliform-bacteria Escherichia coli (E. coli) per 100 millilitres of water is counted. The result is expressed as 'Coliform Microbial Density' and indicates the extent of fecal matter present in it. 

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