Food Preservation and Processing Quiz
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Questions and Answers

What is food preservation?

Food preservation involves the use of specific thermal and non-thermal processing techniques to minimize harmful microorganisms and ensure food safety and longer shelf life.

Name two methods of food preservation.

Canning and freezing are two methods of food preservation.

What is the purpose of food preservation?

The purpose of food preservation is to prevent spoilage, maintain food quality, and extend shelf life.

Define shelf life of food.

<p>Shelf life of food is the period of time during which a product can be stored without significant changes in terms of food quality.</p> Signup and view all the answers

Name two techniques of food preservation.

<p>Drying and vacuum packaging are two techniques of food preservation.</p> Signup and view all the answers

What are the benefits of food preservation?

<p>Food preservation allows for longer storage, maintains food quality, and preserves nutritional value.</p> Signup and view all the answers

What are the products of carbohydrate fermentation?

<p>acid, alcohol, hydrogen sulfide, and carbon dioxide</p> Signup and view all the answers

What is the function of water activity (Aw) in food preservation?

<p>Aw is a measure of free water available for chemical and biological reactions and for the growth of microorganisms.</p> Signup and view all the answers

How is water activity (Aw) measured?

<p>Aw = Ps / Pw (ratio of the vapor pressure in the solution compared to the vapor pressure of pure water)</p> Signup and view all the answers

What are the types of preservation methods mentioned in the text?

<p>Dehydration, Heating, Cooling, Freezing, Radiation</p> Signup and view all the answers

What is the purpose of dehydration method in food preservation?

<p>To reduce water content and water activity (Aw) to make it difficult for microorganisms to survive</p> Signup and view all the answers

What are the features of bound water?

<p>Cannot be easily extracted, can be frozen at very low temperatures, no vapor pressure</p> Signup and view all the answers

What are the features of free water?

<p>Water is easily extracted, and it has a measure called water activity (Aw)</p> Signup and view all the answers

What are the types of dehydration methods mentioned in the text?

<p>Drying by the sun, Continuous hot air drying, Fluidized bed drying</p> Signup and view all the answers

What is the purpose of using high sugar and salt in food preservation?

<p>To reduce water activity (Aw)</p> Signup and view all the answers

What is the effect of high sugar and salt on water activity (Aw)?

<p>It decreases water activity (Aw)</p> Signup and view all the answers

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