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

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"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?

Fungi growing on rotten trees are actually fungi.

3. Why do nutritious milk and rice grains go bad?

When milk and rice go bad, bacteria invisible to our naked eyes are at work.

1. Observe the colonies

What is the difference between bacterial colonies and fungal colonies?

bacterial colony

mold colonies

Different forms of colonies

2. Bacteria colonies

Bacterial colonies: colonies are relatively small

The surface may be smooth and sticky, or rough and dry

Mold colonies:

Belongs to fungal colonies, often fluffy, flocculent, or spider web-shaped, and some also appear in red, brown, green, black, yellow and other colors.

Fungal colonies:

Generally several times or dozens of times larger than bacterial colonies

3. Exploration experiment: detecting bacteria and fungi in different environments

Experimental requirements:

1. Each team selects an environment and detects the distribution of bacteria and fungi in that environment.

2. Design and experimental research plans based on the group’s questions and hypotheses

3. As a group, report the group’s design ideas and implementation plans

4. How to set up a control group and control experimental variables

experiment one:

Ask the question: Are there bacteria or fungi on your hands?

Make an assumption: You have bacteria or fungus on your hands

making plans:

Two identical sets of petri dishes, numbered 1 and 2 respectively;

Use a sterile cotton swab to gently wipe the palm of your hand, spread it lightly in Petri dish No. 1, and cover it. No. 2 will not be processed.

Place the two petri dishes in the incubator for a period of time and observe the results.

Experimental results:

Experimental results:

Experiment 2:

Ask a question: Where are the most fungi in the school garden and cafeteria refrigerator?

Make assumptions:

making plans:

Three sets of identical petri dishes, numbered 1, 2 and 3 respectively;

Place 1 in the garden and 2 in the refrigerator. Open the lid and expose it to the air for three minutes. Close the lid. Leave 3 unprocessed. Place 1, 2, and 3 in an incubator for a period of time and observe the results.

Experimental results:

Experimental results:

1. Why must culture media and petri dishes be treated at high temperatures before inoculation? Why use sterile cotton swabs?

Kill bacteria and fungi on the culture medium and petri dishes to eliminate contamination from other environments outside the experiment.

2. Tip 3 is equivalent to which step in the general culture method of bacteria and fungi?

The operation in Tip 3 is equivalent to the inoculation step in general culture methods.

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

The basic conditions necessary for the life of bacteria and fungi are: water, nutrients, suitable temperature, etc.

test you!

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

Bacteria and fungi need the right 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?

Bacteria and fungi require organic matter to live

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

Moist seeds, bacteria and fungi need moisture to live

Come and see how much you have mastered in this lesson!

1. 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

2. Which of the following does not belong to the characteristics of bacterial colonies ( )

A. The colonies are relatively small B. The surface is smooth and moist

C. The colonies are velvety D. Easy to pick

3. When cultivating bacteria and fungi, the petri dishes and culture media must be treated at high temperature before inoculation. This is because: ( )

A. High temperature is one of the suitable conditions for the survival of bacteria and fungi;

B. Bacteria and fungi thrive in high temperature environments;

C. Bacteria and fungi in the culture medium and petri dishes need to be killed to avoid affecting the experimental results;

D. High temperature treatment can enrich the culture medium with nutrients.

4. In a small experiment to explore whether there are bacteria on the coin, the coin is gently placed on the surface of the bacterial culture medium. This practice is called ( ) in the general culture method of bacteria.

A. Vaccination B. Planting C. Cultivate D. join

5. Which of the following environments is unlikely to contain bacteria or fungi ( )

A. Crater and lava B. Skin and body

C. Ultra-high temperature and ultra-vacuum D. Soil and lakes

6. Not all of the following are indispensable in the life of bacteria ( )

A. Oxygen B. Organic matter C. Water D. Suitable temperature

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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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