Question

Meat which can be spoiled by bacteria such as Salmonella, Clostridium are preserved by a unique method of food preservation. This technique creates free radicals in food, which can destroy cell membranes and attack DNA and proteins, thus preventing growth of microorganisms. Which is this process?

• A. Pasteurisation
• B. Irradiation
• C. Vacuum drying
• D. Freezing

Answer 1

Answer: (B)

The correct option is B Irradiation
Food irradiation is a processing and preservation technique with similar results to freezing or pasteurisation. During this procedure, the food is exposed to doses of ionising energy, or radiation. At low doses, irradiation extends a product’s shelf life. At higher doses, this process kills insects, moulds, bacteria and other potentially harmful micro-organisms. Food irradiation is a form of food processing that extends shelf life and reduces spoilage of food. Foods such as fruits, vegetables, spices and meats can be exposed to radiation to kill insects, moulds and micro-organisms. There are no detectable levels of radiation left behind in the products. Some foods, such as dairy foods and eggs, can't be irradiated because it causes changes in flavour or texture.

Therefore, the correct answer is option B.