Question

Which one of the following combinations of organisms are responsible for the formation and flavour of yoghurt?

• A. Lactobacillus bufgaricus and Streptococcus thetmophilus
• B. Rhizoblum meliloti and Azotobacter
• C. Bacillus subtilis and Escherichia coli
• D. Bacillus megathermus and Xanthomonas species

Answer 1

The correct option is A Lactobacillus bufgaricus and Streptococcus thetmophilus

Yoghurt (yogurt) is produced by curdling milk with the help of Streptococcus thermophilus and Lactobacillus bulgaricus. The temperature is maintained at about ${45}^{o}C({40}^o-{46}^{o}C$) for four hours. It has a flavour of lactic acid and acetaldehyde. Hence the correct option is A.