Question

Souring of milk is due to

• A. Aerobic bacteria
• B. Anaerobic bacteria
• C. Both A and B
• D. None of the above

Answer 1

The correct option is B Anaerobic bacteria

Lactobacilli are anaerobic, rod shaped bacteria that produce lactic acid by anaerobic fermentation. They are responsible for digestion of milk sugar lactose into lactic acids at suitable temperatures which in turn add sour taste to milk.

Therefore, the correct answer is option B.