"Food Preservation" PPT courseware

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"Food Preservation" PPT courseware

Part One: Introduction of New Course

Summer is here and the temperature is higher. If you don't finish the food you buy, such as soy milk and cooked food, they will quickly become rancid and rotten. What are the causes of food spoilage? What are some methods of preserving food in real life?

learning target

1. Explain the causes of food spoilage.

2. Use appropriate methods to preserve food.

Food preservation PPT, part 2: main causes of food spoilage

Read the textbook P67--68 carefully and think about the following questions:

What are the main causes of food spoilage?

Eating food beyond its shelf life may cause illness. Why?

Explore: The main causes of food spoilage

Purpose: Explain that microorganisms are the main cause of food spoilage

Equipment: clarified broth or other fresh food, alcohol lamp, test tube, beaker, glass tube, etc.

process:

1. Ask the question: What are the main causes of food spoilage?

2. Make a hypothesis: The main cause of food spoilage may be the massive growth and reproduction of microorganisms.

Food preservation PPT, Part 3: Use appropriate methods to preserve food

The proliferation of microorganisms is the main cause of food spoilage

So, what methods should be used to preserve food so that we can eat safer?

Self-learning

Read textbook pages 68-69 carefully and think about the following questions:

When preserving food, what are the methods to kill microorganisms or inhibit their growth and reproduction? Please give an example

What are traditional and modern methods of food preservation? Please give an example

Food Preservation PPT, Part 4: Commonly Used Food Preservation Methods

1. Purpose: To investigate the food preservation methods commonly used in daily life

2.Guidance:

⑴ Based on the main causes of food spoilage in daily life, discuss how to effectively preserve food in family life to make food less susceptible to spoilage.

⑵ Record in groups the information on food preservation methods collected on food packaging bags (boxes), and discuss with the whole class: Which food preservation methods are widely used?

Do you know what traditional food preservation methods are?

Air-dried, smoked, soaked in wine, salted, candied, etc.

Do you know what modern food preservation methods are?

Canning, adding preservatives, using enzyme preparations, etc.

Food Preservation PPT, Part 5: Feedback in class

1. The traditional food preservation method is ( )

A.candied B.frozen

C. Vacuum packaging D. Dehydration

2. Among the following, the modern preservation method that is harmless to the human body is ( )

A. Canning method B. Salting

C. Add preservatives D. Use lysozyme

3. The root cause of food spoilage is ( )

A. The temperature is too high B. The reproduction of microorganisms

C. Insect infestation in food D. Too little water in food

4. Which of the following is not a method of food preservation ( )

A. Salting B. Preservation using lysozyme

C. Frozen D. Cooked

Keywords: Jiangsu Education Edition eighth grade biology PPT courseware for the second volume free download, food preservation PPT download, .PPT format;

For more information about the "Food Preservation" PPT courseware, please click on the Food Preservation ppt tab.

"Food Preservation" PPT:

"Food Preservation" PPT Part One Content: Topic Exploration Exploration: Methods to prevent food spoilage Ask questions: How to prevent food spoilage? Hypothesis: Food exposed to air is more susceptible to spoilage. Design experiment: ① Bottle A of broth is exposed to the air. ②B..

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Update Time: 2024-07-03

This template belongs to biology courseware Jiangsu Education Edition 8th Grade Biology Volume 2 industry PPT template

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