Streptococcus lactis is responsible for

Options

A. Conversion of molasses into alcohol
B. Conversion of milk into curd
C. Tanning of leather
D. Flavouring the leaves of tea and tobacco.

Answer

**Step-by-Step Solution:**

1. **Identify the Organism**: The question asks about *Streptococcus lactis*, which is a type of bacteria.

2. **Understand the Function**: *Streptococcus lactis* is known for its role in dairy fermentation. It is primarily involved in the conversion of milk into curd.

3. **Process of Fermentation**: The bacteria carry out fermentation, which is a metabolic process that converts sugars into acids, gases, or alcohol. In the case of *Streptococcus lactis*, it ferments lactose (the sugar present in milk).

4. **Production of Lactic Acid**: During fermentation, *Streptococcus lactis* breaks down lactose and produces lactic acid as a byproduct. This lactic acid is crucial as it causes the milk proteins to coagulate.

5. **Curd Formation**: The coagulation of milk proteins due to lactic acid leads to the formation of curd. This process not only thickens the milk but also gives it a tangy taste.

6. **Conclusion**: Therefore, the correct answer to the question is that *Streptococcus lactis* is responsible for the conversion of milk into curd.

**Final Answer**: *Streptococcus lactis* is responsible for the conversion of milk into curd.

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