removal of moisture content of foods through heat.

Explain the physical changes that occurs to a mango when it is dehydrated.

Loss of moisture changes the shape and size of product. When this occurs the palatability also changes from a soft product to a crunchy or chewy product.

What is the purpose of salt or sugar during the process of dehydration?

Draws moisture from the cells in foods. The salt or sugar dissolve in the moisture and create a concentrated environment that is unsuitable for the growth of microorganisms.

How does altering pH assist in preserving food?

altering the pH in foods creates an environment where microorganisms cannot multiply and cause food spoilage.

Explain the process of altering the pH of a food product.

Denatures the enzymes,destroys micro-organisms in foods and creates an environment that is unsuitable for their growth. The concentration of acid reduces the time and temperatureneeded for cooking.

What ingredients are used to alter pH levels?

salt, sugar, vinegar, lemon juice

Describe the purpose of Vacuum sealing.

removes the majority of oxygen from the packaging. This vastly reduces the ability of aerobic (oxygen-dependent) bacteria, which is a prime reason for spoilage. Not only does the reduced ability of bacteria help extend the shelf life of your food, but oxygen itself is often the culprit, involved in several chemical reactions that result in food spoilage.

Explain the purpose of adding chemical.

addition of salt produces an environment that retards the growth of microorganisms that cause food spoilage. The process of osmosis causes water to move from a solution of low concentration (the cells of the microorganisms), to one of higher concentration (the salt).

The addition of salt to a food product is to:

retard the microorganisms and preserve food product

Why is freezing an ideal food preservation technique?

reducing the temperature of the foods creates an environment where microorganisms cannot multiply and cause food spoilage.

bacteria cannot grow as the temperature drops and freezes/ stop growth

Why is it important that products to be frozen and packaged and sealed effectively?

To ensure ice crystals are minimal as these deteriorate the shelf life of the product.

Food can get freezer burn and deteriorate the product.

Food Preservation

Quiz

•

Science, Specialty, Other

•

11th - 12th Grade

•

Practice Problem

•

Hard

Sara Dhue

Used 169+ times

FREE Resource

20 questions

Show all answers

1.

FILL IN THE BLANK QUESTION

1 min • 1 pt

What is the purpose of food preservation?

2.

FILL IN THE BLANK QUESTION

1 min • 1 pt

List two factors that can cause food spoilage.

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following are food preservation methods?

Freezing, vacuuming sealing, boiling

Freezing, dehydrating, canning

Dehydrating, frying, canning

4.

FILL IN THE BLANK QUESTION

1 min • 1 pt

Define Dehydration

5.

FILL IN THE BLANK QUESTION

1 min • 1 pt

Identify a recipe and the preservation technique that is used.

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the danger zone?

4-60 celsius

5-80 celsius

5-60 celsius

7.

FILL IN THE BLANK QUESTION

1 min • 1 pt

What is the purpose of sugar in a yeast mixture?

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