All of the following are methods of food preservation except:

• A. Refrigeration
• B. Autoclaving
• C. Fermentation
• D. Pasteurization

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the concept of food preservation, which involves methods used to prevent food spoilage by inhibiting the growth of microorganisms or slowing down their activity.
2. Step 2: Review each option to determine if it is commonly used as a food preservation method:
3. - Refrigeration: This method slows down microbial growth by lowering the temperature, thus preserving food.
4. - Fermentation: This process uses beneficial microbes to convert food components, producing acids or alcohol that inhibit spoilage organisms, effectively preserving food.
5. - Pasteurization: This involves heating food to a specific temperature to kill harmful microbes, extending shelf life without sterilizing the food completely.
6. Step 3: Analyze autoclaving, which is a sterilization method using high-pressure saturated steam, typically used for sterilizing medical equipment and laboratory media, not for food preservation because it can alter food quality and is not practical for most food products.
7. Step 4: Conclude that autoclaving is not a standard method of food preservation, unlike the other options listed.