Correct Answer - Option 4 : Spore-forming
Coliforms/B. Coli/E.coli:
1. E-coli bacteria are a gram negative, non-spore forming and facultativeaerobic bacteria.
2. These are harmless aerobic microorganisms which are found residing in the intestines of all ward blooded animals including human beings.
3. These are rod shaped non-pathogenic bacteria i.e. bacilli.
4. Their presence or absence in water indicates presence or absence of fecal pollution and hence, pathogens.
5. They are measured using: 1. Member Filter Technique and 2) Test Tube Method (MPN)
6. Safe limit for drinking water is < 1 coliforms colony per 100 ml of water.
