Mention a product of human welfare obtained with the help of each one of the following microbes :
(a) LAB
(b) Sacchromyces cerevisiae
(c) Propionibacterium shermanii
(d) Aspergillus niger

Explanation

To answer the question regarding products of human welfare obtained from specific microbes, we can break down the contributions of each microbe as follows:

### Step-by-Step Solution:

1. **Lactic Acid Bacteria (LAB)**:
- **Microbe**: Lactobacillus
- **Product**: Curd
- **Explanation**: Lactic Acid Bacteria are used in the fermentation process to produce lactic acid from sugars. This lactic acid is essential for the formation of curd from milk. LAB acts as a starter culture in dairy products, enhancing flavor and preserving the product.
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