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Hunan Education Edition Fifth Grade Science Volume 2	pptx	6 MB

"How Microorganisms Live" PPT

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Upload Time: 2024-09-16

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Hunan Education Edition fifth grade science volume 2, how microorganisms live PPT

Part One: Reproduction of Bacteria

In the last lesson, we knew that microorganisms are everywhere, so how do they live?

Today we take bacteria as an example to explore the life of microorganisms!

Bacteria that multiply "crazy"

Under suitable conditions, some bacteria can divide approximately every 20 minutes. The number of bacteria is represented by black dots in the graph below. See how many bacteria will grow after 100 minutes.

What kind of environment are microorganisms suitable for?

Microorganisms such as bacteria have a strong ability to reproduce, but their growth also requires suitable environmental conditions. What kind of environment are they generally more suitable to live in? Please make conjectures based on our life experiences.

guess:

1. During the rainy season...

2. Food in summer is more likely to spoil, I think...

3. Bacteria are generally suitable for warm environments.

How Microorganisms Live PPT, Part 2: Designing Experiments

Is our guess correct? Can you design some experiments to verify it?

Research question: What environments do bacteria adapt to?

Our hypothesis: Bacteria are adapted to warm environments.

Research method: experimental method

Research steps:

1. Take two portions of fresh milk of the same quality and quantity.

2. Keep one part in a warm environment and one part in the refrigerator.

3. Observe the changes produced by the two servings of milk.

Make yogurt

Yogurt is everyone's favorite food. It is made from fresh milk fermented by lactic acid bacteria.

In the process of making yogurt, in order to provide a better growth environment for lactic acid bacteria and prevent interference and destruction by other microorganisms, what methods can you use to achieve this?

Keywords: Hunan Education Edition fifth grade science PPT courseware for the second volume free download, how microorganisms live PPT download, .PPT format;

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Update Time: 2024-09-16

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"How Microorganisms Live" PPT