"Slow down the speed of food spoilage" Food PPT download

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"Slow down the speed of food spoilage" Food PPT download

Part One: Importing New Knowledge

There is often some food in the pantry and drawers at home. How can we preserve the food for a long time without deteriorating?

Slow down the speed of food spoilage PPT, part 2: new knowledge explanation

1. Observe spoiled food

Observe a fresh small dried fish and fresh dried noodles.

think:

How should you observe fresh dried fish and fresh dried noodles?

Take a look, smell, taste

How should you observe a rotten little fish? What tools are needed? What else should I pay attention to?

1. Do not touch food directly with your hands.

2. Wash hands with soap after observation.

3. Use fan-sniffing method to smell, and try to smell as little as possible.

Tips: Reasons why food spoils

Food spoilage is caused by microorganisms. The mold that makes bread moldy is a microorganism, and many bacteria that are invisible to the naked eye and cannot be seen with a magnifying glass are also microorganisms.

The growth and reproduction of microorganisms, like plants and animals, require certain conditions. In the right environment, they can reproduce quickly. More and more microorganisms decompose and absorb the nutrients in the food, and at the same time excrete waste, so that the food is no longer the same as it was before, and the food becomes spoiled.

2. Various methods of storing food

1. Put it in the refrigerator to freeze

2. Dried fish

3. Pickle with salt to make salted fish

4. Canned

Slow down the speed of food spoilage PPT, part 3: Consolidation exercises

1. Choice

1. Among the following options, ( ) is the most susceptible to mold.

A． Bread placed in a dry and room temperature environment

B. Bread placed in a humid room temperature environment

C. Bread placed in a humid and low-temperature environment

2. The conditions that are not required for the growth and reproduction of microorganisms are ( )

A． air b. Nutrition c. Sunlight

2. Judgment

1. Food spoilage is caused by the proliferation of microorganisms. ( )

2. The growth and reproduction of microorganisms require air, moisture and suitable temperature. ( )

3. When you smell spoiled food, fan it and try to smell it as little as possible. ( )

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For more information about the PPT courseware "Food Slows Down the Speed ​​of Food Spoiling", please click on the "Food ppt Slows Down the Speed ​​of Food Spoiling" ppt tag.

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Update Time: 2024-09-30

This template belongs to science courseware Fourth Grade Science Volume 2, Textbook Edition industry PPT template

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