"Distribution of Bacteria and Fungi" Bacteria and Fungi PPT Courseware 5

Description

"Distribution of Bacteria and Fungi" Bacteria and Fungi PPT Courseware 5

learning target

1. Roughly distinguish between bacterial and fungal colonies.

2. Learn the general methods of cultivating bacteria and fungi, and explore the distribution of bacteria and fungi.

3. Know the general conditions required for the life of bacteria and fungi and the special conditions required for the life of different bacteria.

Self-study guidance

(1) Please carefully read the content on pages P66-67 of the textbook silently and think about the following questions:

1. What is a colony?

2. Observe Figure 5-40 of P67. What kinds of colonies appear on this medium? How to distinguish these two colonies?

(2) Ask students to read the second paragraph of textbook P67 and summarize the general methods of cultivating bacteria and fungi.

2. General methods for culturing bacteria and fungi

1. Prepare a culture medium containing nutrients: beef juice (or soil leachate, milk, etc.) + agar

2. High temperature sterilization (cooling)

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

4. 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.

discuss

1. Why must culture media and petri dishes be sterilized at high temperatures before inoculation? Why use sterile wands?

Answer: If high-temperature sterilization is not performed, the petri dishes and culture media may carry bacteria or other microorganisms that may interfere with the results... Sterile cotton swabs are also used to ensure the accuracy of the results.

2. Through communication between each group, what do you think of the distribution of bacteria and fungi?

Answer: The distribution of bacteria and fungi is almost everywhere, but the distribution in different environments is somewhat different. For example, there are more bacteria and fungi on hands and coins.

3. What environmental conditions are impossible for bacteria and fungi to exist? Isn't it possible that bacteria and fungi are not present in this inquiry? What's going on? Why?

Answer: Bacteria and fungi cannot 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.

1. In hot summer, food is prone to spoilage and more people suffer from gastroenteritis. Why?

Answer: Bacteria and fungi need a suitable temperature to live.

2. In summer, damp food, clothing and leather shoes often become moldy and hairy. Why are damp glass, stone and cement walls not prone to mold?

Answer: Bacteria and fungi need organic matter to live

3. Which one is more likely to mold, sun-dried seeds or moist seeds? Why?

Answer: Moist seeds, bacteria and fungi need moisture to live

5. Which of the following statements about the characteristics of bacterial colonies is wrong ( ).

A. Relatively small B. Or smooth and sticky

C. Or rough and dry D. Larger

6. A large number of bacteria can cause food to spoil. Food can be stored in the refrigerator for a period of time without spoiling. The main reason is that it is in the refrigerator environment ( ).

A. No bacteria B. Bacteria reproduce slowly

C. Bacteria are frozen to death D. Bacteria "hibernate"

7. Which of the following has nothing to do with the existence of bacteria and fungi ( )

A. Wash your hands before and after meals B. Wash your hands and flush the toilet after using the toilet

C. Carry out household disinfection frequently D. Water flowers and plants frequently

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Update Time: 2024-11-24

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

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