Preserving Milk

Milk is a highly perishable food item that can spoil quickly if not properly preserved. To extend its shelf life and maintain its quality, various preservation methods are employed. In this case, Asma uses the process of boiling the milk and keeping it in a refrigerator.

Boiling the Milk
Boiling milk is a common preservation technique used to kill harmful bacteria and microorganisms present in the milk. When milk is heated to a temperature of around 100 degrees Celsius, it undergoes a process called pasteurization. This process destroys most of the bacteria and pathogens that can cause spoilage and lead to health issues.

Refrigeration
After boiling the milk, Asma keeps it in a refrigerator. Refrigeration is an effective method for preserving milk as it helps to slow down the growth of bacteria and microorganisms. The low temperature inside the refrigerator inhibits the growth of spoilage-causing bacteria and helps to maintain the freshness and quality of the milk for a longer period.

Benefits of Boiling and Refrigerating Milk
1. Killing Bacteria: Boiling milk kills harmful bacteria and microorganisms that can cause diseases and spoilage.
2. Extended Shelf Life: Boiling and refrigeration together help to extend the shelf life of milk, allowing it to remain safe for consumption for a longer duration.
3. Maintaining Quality: By inhibiting bacterial growth, these preservation methods help to maintain the taste, texture, and nutritional value of milk.
4. Safety: Pasteurized milk is considered safe for consumption as it undergoes a process that eliminates most harmful bacteria.

Other Options
The other options mentioned in the question are not suitable for preserving milk:
a) Adding salt solution to the milk: Salt is not commonly used for milk preservation as it can alter the taste and texture of the milk.
c) Adding a sugary syrup solution to the milk: This option is not used for milk preservation as it can promote the growth of bacteria and lead to fermentation.
d) Drying the entire milk: Drying milk involves removing the moisture content, resulting in the production of milk powder. While this is a method of preserving milk, it is not the process used by Asma in this case.

Therefore, the correct option is b) She boils the milk and keeps it in a refrigerator.

Milk is boiled to kill germs