Yogurt is a dairy product. It is produced by the fermentation of milk sugar. Which of the following micro organisms is involved in yoghurt production?

Options

A. Bacteria
B. Protists
C. Fungi
D. Virus

Answer

**Step-by-Step Solution:**

1. **Understanding Yogurt Production**: Yogurt is a dairy product made by fermenting milk. The fermentation process involves converting milk sugar into lactic acid.

2. **Identifying Milk Sugar**: The sugar present in milk is known as lactose. During yogurt production, lactose is converted into lactic acid by specific microorganisms.

3. **Recognizing the Microorganism**: The primary microorganism responsible for the fermentation of lactose into lactic acid in yogurt production is a type of bacteria known as Lactobacillus.

4. **Understanding the Role of Lactobacillus**: Lactobacillus bacteria are rod-shaped and play a crucial role in the fermentation process. They convert lactose into lactic acid, which causes the milk to thicken and develop a sour taste.

5. **Conclusion**: Therefore, the microorganism involved in yogurt production is Lactobacillus, which is a type of bacteria.

**Final Answer**: The microorganism involved in yogurt production is Lactobacillus (bacteria).

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