"Distribution of Bacteria and Fungi" Bacteria and Fungi PPT Courseware 2

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"Distribution of Bacteria and Fungi" Bacteria and Fungi PPT Courseware 2

[Think about it, discuss it]

A chicken farm is not a hospital, so why do breeders wear white coats like doctors? Why don’t you wear a white coat when feeding free-range chickens?

Prevent bacterial infection and spread of diseases.

Free-range chickens have strong resistance.

How can we see the "true face" of bacteria?

1. Electron microscope observation or high-power microscope

2. We study bacteria and fungi by observing _______;

2. General methods for cultivating bacteria or fungi

1: Prepare culture medium

2. High temperature sterilization

3. Vaccination

4. Constant temperature culture

How to grow colonies?

1. Prepare culture medium: agar, nutrients

2. High temperature sterilization: kill miscellaneous bacteria

3. Vaccination

4. Constant temperature culture: suitable temperature

Why do the petri dishes and culture media used for culture need to be treated at high temperatures before inoculation? Why do we need to use sterile cotton swabs?

Because after high temperature treatment, the spores of bacteria and fungi mixed on the petri dish and in the culture medium can be killed, thus eliminating contamination from other environments outside the experiment.

The purpose of using sterile cotton swabs in the experiment is also to prevent microorganisms on the cotton swabs from contaminating the culture medium.

3. Under what environmental conditions are bacteria and fungi unlikely to exist?

It is impossible for bacteria and fungi to exist in an environment that has undergone strict high-temperature sterilization, such as a set of petri dishes in the control group, because the petri dishes in the control group have been sealed after high-temperature sterilization.

Why do I need to add nutrients when preparing culture media? What basic conditions are necessary for bacteria and fungi to live?

Nutrients must be added when preparing the culture medium because most bacteria and fungi cannot synthesize organic matter on their own and can use readily available organic matter.

What are the basic conditions necessary for bacteria and fungi to live?

Water, nutrients, suitable temperature, and a certain living space.

How did you learn?

1. Bacteria and fungi are distributed in ( ).

①In soil ②In water

③In the air ④On living organisms

A.①② B. ③④

C.②③④ D.①②③④

2. Which of the following descriptions about bacterial colonies is correct ( ).

A. Each colony is composed of a large number of different species of bacteria

B. From the shape, size and color of the colonies, bacteria and fungi can be roughly distinguished, as well as their types.

C. Bacterial colonies are often fluffy, flocculent or spider web-shaped

D. A colony is formed from one bacterial cell

Textbook exercises

3. A classmate inoculated two bacteria, A and B, on an agar medium for culture. At the same time, he also placed pieces of paper soaked in salt water on the medium. After one day of constant temperature cultivation, only A bacteria grew around the salt paper. How do you interpret the results of this experiment?

The results of this experiment show that the two bacteria A and B have different adaptability to the environment:

A bacteria can survive in salt water environment,

B bacteria cannot survive in salt water environments.

This shows that different bacteria require different survival conditions.

4. The principle of making kimchi is to use lactic acid bacteria to make the organic matter in vegetables produce lactic acid. The structure of the kimchi jar requires both a lid and a circle of water to seal it. Can you guess the scientific reason behind it?

The kimchi jar is covered with water and sealed with water. The purpose is to prevent air from entering the jar and maintain an oxygen-deficient environment in the jar. Because lactic acid bacteria can only survive in an oxygen-deficient or anaerobic environment, they can decompose organic matter in vegetables into lactic acid.

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Update Time: 2024-11-22

This template belongs to biology courseware People's Education Edition Biology for Grade 8, Volume 1 industry PPT template

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