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Souring of milk is due to—

  By GK Planet Team      
Q. Souring of milk is due to—
  1. Protozoa
  2. Virus
  3. Bacteria
  4. Nematode
Answer: 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 a sour taste to milk.

Q. Souring of milk is due to
  1. Aerobic bacteria
  2. Anaerobic bacteria
  3. Both A and B
  4. None of the above
Answer: Anaerobic bacteria
The sugar is called lactose and the harmless bacteria is called lactobacillus which uses lactose for energy and creates lactic acid as a by-product. It is the lactic acid which makes milk taste sour.
The speed of sour­ing is af­fect­ed by:
  1. tem­per­a­ture – the high­er it is, the greater the sour­ing ef­fect;
  2. a dirty con­tain­er – the pres­ence of wa­ter, fat, dust, etc. in the milk con­tain­er can dou­ble the speed of the time it takes milk to go sour.
  3. the weath­er – if you put a milk jug on the win­dow sill dur­ing a storm, in the morn­ing you will have home-made ke­fir. Sci­en­tists can­not give a pre­cise ex­pla­na­tion of this process, but many be­lieve that it is caused by elec­tro­mag­net­ic im­puls­es.
  4. spe­cif­ic bac­te­ria – spe­cial­ly cre­at­ed sub­stances de­signed for a quick­er and more ef­fec­tive change of milk into ben­e­fi­cial fer­ment­ed milk prod­ucts. They in­clude ke­fir fun­gi (ke­fir), lac­tic yeast (yo­ghurts), pro­pi­onic bac­te­ria (cot­tage cheese) and lac­to­bacil­lus (boiled fer­ment­ed milk).

Is milk souring a physical or chemical change?
Chemical Change
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