"Distribution of Bacteria and Fungi" Bacteria and Fungi PPT Courseware 9

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"Distribution of Bacteria and Fungi" Bacteria and Fungi PPT Courseware 9

1. Observe the colonies

The visible aggregate formed by the reproduction of a bacterium or fungus is called a colony. (P55)

What is the difference between bacterial colonies and fungal colonies?

2. General methods for culturing bacteria and fungi

1. Prepare culture medium containing nutrients.

Beef juice + agar

2. High temperature sterilization

3. Cool down

4. Inoculation - the process of placing a small amount of bacteria or fungi on a culture medium

5. Constant temperature culture. Place the inoculated petri dish in an incubator that maintains a constant temperature, or it can be cultured in a warm place indoors.

3. Explore bacteria and fungi in different environments

question

Are bacteria and fungi found in different environments? Which environment has more of them? Which environment has less of them? Which environment doesn't have them at all?

Explore ideas

If you were asked to help the kindergarten teachers think of a way to let the children know that there are bacteria or fungi on their hands and they must wash their hands before eating, what would you do? Refer to the picture below.

hint:

1. Do not open the petri dish before thinking about how to work. Think about it, why use two sets of culture dishes? What are the benefits of each?

The purpose is to set up controls. One set is not treated and is the control group; the other set is treated and is the experimental group.

2. Mark the group, experiment date, and number (No. 1 or 2) on the label paper, and stick the label on the bottom of the petri dish.

3. Collect bacteria and fungi in their respective selected environments.

4. Consider the environmental conditions under which the culture should be cultured. Do the culture dishes of both sets of culture media need to be cultured in the same environment?

5. Design a form for observation records and plan the time and frequency of observations.

discuss

1. 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?

2. Tip 4 is equivalent to which step in the general culture method of bacteria and fungi?

3. Through the communication between the groups, what do you think about the distribution of bacteria and fungi?

4. Under what environmental conditions are bacteria and fungi unlikely to exist? In this investigation, which situation is impossible? Why?

5. Summarize based on your inquiry activities: What are the basic conditions necessary for the life of bacteria and fungi?

4. Widely distributed bacteria and fungi

Bacteria that survive in extreme environments

1. A group of archaea discovered by the German Steeter research team on the Italian seabed can live in high temperatures above 110°C. The optimal growth temperature is 98°C and stops growing when it drops to 84°C.

2. J. A. Baross of the United States discovered that some bacteria isolated from volcanic craters can live in an environment of 250°C.

5. Survival conditions of bacteria and fungi

Methanogens: obligate anaerobic bacteria

Judgment: Bacteria and fungi cannot exist in an oxygen-free environment.

Living conditions for bacteria and fungi:

Moisture, suitable temperature, organic matter, living space.

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"Distribution of Bacteria and Fungi" Bacteria and Fungi PPT Courseware 8:

"Distribution of Bacteria and Fungi" Bacteria and Fungi PPT Courseware 8 New Lesson Introduction 1. What do bacteria and fungi look like? 2. Where are the bacteria and fungi? 3. How do you know bacteria and fungi exist? Think about why steamed buns grow hair after being stored for a long time? ..

"Distribution of Bacteria and Fungi" Bacteria and Fungi PPT Courseware 7:

"Distribution of Bacteria and Fungi" Bacteria and Fungi PPT Courseware 7 Review the past and learn the new 1. Before injecting drugs into patients, nurses always wipe the injection site with an alcohol cotton ball several times. Do you know the reason for doing this? Tip: The purpose of this is to remove bacteria from the surface of the skin..

"Distribution of Bacteria and Fungi" Bacteria and Fungi PPT Courseware 6:

"Distribution of Bacteria and Fungi" Bacteria and Fungi PPT Courseware 6 Think about it 1. Why do steamed buns grow hair after being stored for a long time? Steamed buns that have been stored for a long time will grow hair, which is the result of the reproduction of mold in the fungus. 2. How come fungus grows on rotten branches? rot..

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Update Time: 2024-11-21

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

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