Biology - Microbes in Human Welfare Question with Solution | TestHub

Yoghurt is a fermented milk product produced commercially by adding a starter culture containingStreptococcus thermophilusandLactobacillus bulgaricusto milk.

These bacteria ferment the lactose in milk to produce lactic acid, which acts on milk protein to give yoghurt its texture and characteristic tart flavor.

Propionibacterium shermaniiis used in the production of Swiss cheese,Penicillium roquefortiiis used for Roquefort cheese, andAcetobacter acetiis used for the production of acetic acid.

Answer:Streptococcus thermophilusandLactobacillus bulgaricus.