Question

Which treatment is specifically used to remove undesirable microbes from milk?

• A. Sterilization
• B. Pasteurization
• C. Homogenization
• D. Fermentation

Hint:

Pasteurization = Heat treatment to kill harmful microbes in milk while preserving quality.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
The question asks to identify the specific process used to make milk safe for consumption by eliminating harmful microbes, while aiming to preserve its quality.
Step 2: Key Processes in Milk Processing:
- Pasteurization: A heat treatment process designed to kill pathogenic (disease-causing) microorganisms and reduce the number of spoilage organisms in milk. It uses a relatively mild heat (e.g., 72°C for 15 seconds for HTST) followed by rapid cooling. This process preserves most of the milk's nutritional and sensory properties.
- Sterilization (e.g., UHT): A much more intense heat treatment (e.g., 135°C for 2-5 seconds) that kills all microorganisms, including spores. This results in a very long shelf life at room temperature but can cause more significant changes to the taste and nutritional value of the milk.
- Homogenization: A mechanical process that breaks down large fat globules in milk into smaller ones. It prevents the formation of a cream layer and ensures a uniform consistency. It does not kill microbes.
- Fermentation: A biological process where beneficial microbes (like bacteria in yogurt) are intentionally added to milk to convert lactose into lactic acid, leading to products like yogurt and cheese. It is the opposite of removing microbes.
Step 3: Detailed Explanation:
- The question's focus is on removing "undesirable microbes" to make milk safe.
- Pasteurization is the standard industry process specifically developed for this purpose, balancing safety with quality retention.
- While sterilization also removes microbes, it is a more severe process. Pasteurization is the more common and specific answer for making fresh milk safe.
- Homogenization and fermentation are unrelated to the removal of unwanted microbes.
Step 4: Final Answer:
Pasteurization is the treatment specifically used to remove undesirable microbes from milk.