Dosa & Idli are prepared by the action of

Options

A. Rhizopus oryzae
B. Lactobacillus
C. Leuconostoc mesenteroides
D. Saccharomyces cerevisiae

Answer

To answer the question "Dosa & Idli are prepared by the action of," we need to identify the specific microorganism involved in the fermentation process that leads to the preparation of these traditional South Indian dishes.

### Step-by-Step Solution:

1. **Understanding the Ingredients**: Dosa and Idli are made from a batter that primarily consists of rice and urad dal (black gram). The fermentation of this batter is crucial for the texture and flavor of the final products.

2. **Identifying the Fermentation Process**: The fermentation process involves the action of specific microorganisms that convert the carbohydrates present in the batter into acids and gases. This not only helps in leavening the batter but also enhances its nutritional value.

3. **Microorganisms Involved**:
- The options provided include various microorganisms:
- **Rhizopus**: Used in enzyme production.
- **Lactobacillus**: Known for converting milk to curd.
- **Leuconostoc mesenteroides**: This is the key microorganism for dosa and idli preparation.
- **Saccharomyces cerevisiae**: Primarily used in wine production.

4. **Correct Answer**: Among the options, **Leuconostoc mesenteroides** is the microorganism that is specifically responsible for the fermentation of the batter used in making dosa and idli. It produces lactic acid and carbon dioxide during fermentation, which is essential for the texture and flavor of these dishes.

5. **Conclusion**: Therefore, the correct answer to the question is **Leuconostoc mesenteroides**.