Which of the following methods works primarily by inhibiting microbial growth through low moisture?
Show answer & explanation
Correct answer: C
Explanation
Correct Answer
Dehydration
Explanation
Dehydration, or drying, is a food preservation process in which moisture or water content is removed from food. Since microorganisms such as bacteria, yeast, and mold require water to survive and multiply, reducing the water content inhibits their growth. This method is highly effective in extending the shelf life of food because microorganisms cannot remain active in a dehydrated state.
Refrigeration merely slows down the metabolic activities of microorganisms rather than reducing moisture. Canning protects food from air and microorganisms by sealing it in containers. Pasteurization is a process primarily used to destroy harmful microorganisms by utilizing high temperatures.
Key Points
The primary principle of dehydration is to reduce water activity so that microorganisms cannot spoil the food product. This process can be carried out by sun-drying, using an oven, or through industrial dryers. Dehydration also reduces the weight and size of food, which facilitates easier storage and transportation.
Important Questions and Answers
Question: For which food product is pasteurization primarily used?
Answer: For milk and dairy products.
Question: What is the primary objective of 'refrigeration' in food preservation?
Answer: To slow down the growth rate of microorganisms at low temperatures so that food remains safe for a longer period.