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Jiangsu Education Edition 8th Grade Biology Volume 2	pptx	6 MB

"Food Preservation" PPT

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Upload Time: 2024-10-02

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"Food Preservation" PPT

Part One Content: Topic Exploration

Explore: Ways to Prevent Food from Spoiling

Ask the question: How to prevent food from spoiling?

Hypothesis: Food exposed to air is more susceptible to spoilage.

design experiment:

①Bottle A of broth is exposed to the air.

② Boil the broth in bottle B and seal it for 3 days.

③Compare two bottles of broth.

Use appropriate methods to preserve food:

Traditional preservation methods: sun-drying, air-drying, salting, smoking, wine soaking, etc.

Modern preservation methods: canning, dehydration, freezing, vacuum packaging, adding preservatives, etc.

Part 2: Practice

1. The root cause of food spoilage is ()

A. Too high temperature B. Propagation of microorganisms

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

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

A. Salting B. Preservation using lysozyme

C. Frozen D. Cooked

3. The traditional preservation method is: ( )

A.candied B.frozen

C. Vacuum packaging D. Dehydration

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

A. Canned fertilizer B. Salted

C.Add preservatives D.Use deep enzyme

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 courseware:

"Food Preservation" PPT courseware Part One: Introduction of new lesson Summer is here and the temperature is high. 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? In real life, there are...

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Update Time: 2024-10-02

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"Food Preservation" PPT