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Which of the following statement is incorrect regarding Yoghurt?(a) It is a fermented milk(b) Mixed with an inoculum containing Streptococcus faecalis(c) Preparation takes approximately 4-5 hours(d) The original flavour of yoghurt is of acetaldehydeThis question was posed to me during a job interview.The above asked question is from Microbes in Household Products-1 topic in portion Microbes in Human Welfare of Biology – Class 12

Answer»

Right option is (b) Mixed with an inoculum containing Streptococcus faecalis

For explanation I WOULD say: Yoghurt is fermented milk. The milk is heated to 80-90°C for half an hour and then it is COOLED to 40-43°C and mixed with an inoculum containing Streptococcus thermophilus and Lactobacillus bulgaricus. Preparation of yoghurt takes APPROXIMATELY 4-5 hours. The original flavour of yoghurt and other fermented KINDS of milk is of acetaldehyde.


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