Which of these microbes is used in the inoculum to form curd ?

Options

A. Lactobacillus acidophilus
B. Agrobacterium tumefaceins
C. Streptococcus thermophiles
D. Streptococcus faecalis

Answer

To solve the question "Which of these microbes is used in the inoculum to form curd?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Process of Curd Formation**: Curd is formed through the fermentation of milk. This process involves the action of specific bacteria that convert lactose (milk sugar) into lactic acid.

2. **Identify the Key Microbes**: The question provides four options:
- Option 1: Lactobacillus acidophilus
- Option 2: Agrobacterium tumefaciens
- Option 3: Streptococcus thermophilus
- Option 4: Streptococcus fecalis

3. **Analyze Each Option**:
- **Lactobacillus acidophilus**: This is a type of lactic acid bacteria that is commonly used in the production of yogurt and curd. It helps in digesting milk proteins and coagulating milk, leading to curd formation.
- **Agrobacterium tumefaciens**: This bacterium is primarily known for its role in plant pathology and is not involved in curd formation.
- **Streptococcus thermophilus**: This is also a lactic acid bacterium used in yogurt production, but it is not as commonly referred to as the primary inoculum for curd.
- **Streptococcus fecalis**: This bacterium is associated with the human gut and is not used in curd formation.

4. **Conclusion**: Based on the analysis, the most appropriate choice for the microbe used in the inoculum to form curd is **Lactobacillus acidophilus** (Option 1).

### Final Answer:
The correct answer is **Option 1: Lactobacillus acidophilus**.

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