"Distribution of Bacteria and Fungi" Bacteria and Fungi PPT Courseware 3

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"Distribution of Bacteria and Fungi" Bacteria and Fungi PPT Courseware 3

Why do nutritious milk and rice grains go bad?

It’s bacteria that we can’t see with the naked eye that is causing the trouble!

There are many bacteria and fungi in the air. I would like to ask the students to help me "catch" 100 bacteria and bring them to me. Is it possible to complete this task? why?

No, because the bacteria are too small.

How can you see bacteria with the naked eye?

A visible aggregate formed by the reproduction of bacteria or fungi, called a colony

3. Examine bacteria and fungi in different environments

Are bacteria and fungi found in different environments?

Which environment is more common? Which environment is less common? In which environment is there none at all?

Such as: ① Distribution of bacteria in classrooms, stairways, and playgrounds

② Bacteria in the air, water, and soil

③Bacterial distribution on coins and coins

④Distribution of bacteria in the air when there are people in the classroom and when no one is around

⑤The distribution of bacteria on hands before and after washing hands

test you!

1. Food is prone to spoilage in hot summer, but not in winter. Why?

The life of bacteria and fungi requires suitable temperature. Low temperature can inhibit the growth and reproduction of bacteria.

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 mold, sun-dried seeds or moist seeds? Why?

Moist seeds, bacteria and fungi need moisture to live

Homework

1. Judgment:

(1) There are generally no bacteria and fungi in high-temperature sterilized petri dishes.

(2) Since both bacteria and fungi can form colonies, it is impossible to distinguish bacteria and fungi from the colonies.

2. In which of the following environments is mold most likely to grow? ( )

A. Dry leather shoes

B. Boiled but sealed beef juice

C. Wet grain pile

D. Moist sandy soil

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: Bacteria A can survive in a saltwater environment, while bacteria B cannot survive in a saltwater environment.

This shows that different bacteria require different survival conditions.

science and life

According to the survival conditions of bacteria and fungi,

What advice would you give to your mother on how to preserve food?

Please learn how to collect and preserve food under the class.

Extracurricular small debate:

Are bacteria and fungi good or bad?

Please clarify your arguments!

How should we view them?

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Update Time: 2024-11-19

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

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