Question

Name the organisms which are added in 1:1 proportion for the synthesis of yoghurt.

• A. Brevibacterium and Corynobacterium
• B. Streptococcus thermophilus and Lactobacillus delbrueckii
• C. Lactobacillus casei and Bifidobacterium bifidum
• D. Acetobacter and Glucanobacter

Answer 1

The correct option is B Streptococcus thermophilus and Lactobacillus delbrueckii

For curd formation to start, bacterial strains of Streptococcus thermophilus and Lactobacillus delbrueckii are added to it in 1:1 proportion. This bacteria breaks down the lactose(milk sugar) to lactic acid. Production of acid reduces the pH of milk, coagulating it to curd. Initially during this process , small amount of curd is added to milk. This curd acts as an inoculum, supplying the bacteria.