Explain the changes that milk undergoes when suitable starter/inoculum is added to it. How does the end product formed prove to be beneficial for human health ?

Correct Option:
Lactobacillus / lactic acid bacteria (LAB) present in inoculum , grows in milk at a suitable / optimum temperature, multiplies converting milk to curd, produce acids that coagulate and partially digest the milk proteins.
This improves its nutritional quality by increasing Vitamin B12 , LAB check diseases causing microbes in our stomach

Detailed Explanation:

1. Mechanism of Milk Conversion to Curd:
A small amount of curd, which acts as a starter or inoculum, contains millions of Lactic Acid Bacteria (LAB) such as Lactobacillus. When added to warm milk maintained at a suitable or optimum temperature, these bacteria multiply rapidly. As they grow, they produce lactic acid. This acid lowers the pH of the milk, causing the milk proteins (primarily casein) to coagulate and undergo partial digestion, changing the liquid milk into thick, semi-solid curd.

2. Nutritional Enhancement (Vitamin B₁₂ Enrichment):
The fermentation process mediated by LAB significantly improves the nutritional profile of milk. During curd formation, the content of Vitamin B₁₂ is substantially increased, making the curd a richer source of this essential vitamin compared to raw milk.

3. Gut Health and Disease Prevention:
In the human digestive system, particularly in the stomach, LAB play a crucial protective role. They act as beneficial probiotics that monitor and check the growth of harmful, disease-causing micro-organisms, thereby maintaining a healthy microbial balance in the gut.