"Bacteria" Bacteria and Fungi PPT Courseware 2

Description

"Bacteria" Bacteria and Fungi PPT Courseware 2

1. Teaching objectives:

Knowledge and skills:

1. Describe the morphological and structural characteristics of bacteria.

2. Infer the nutritional mode of bacteria by comparing with animal and plant cells

3. Combined with the reality of life, speculate on the reproductive mode of bacteria.

Process and methods: By observing and comparing the structure of bacteria and the cell structure diagrams of animals and plants, students can develop their observation skills and ability to analyze problems. Cultivate students' ability to apply the knowledge they have learned to explain practical problems in life.

Emotional attitudes and values: By understanding the process of discovering bacteria and Pasteur's experiments, students will realize that scientific development is inseparable from the progress of experimental technology, and it also relies on scientists' tireless pursuit and rigorous and realistic scientific research style. pass

Study and research on the reproduction methods of bacteria, realize that bacteria reproduce very quickly, and unhygienic living habits can easily lead to bacterial infection, so as to cultivate students' good hygiene habits.

2. Important and difficult points in teaching

Teaching focus: Characteristics of bacterial morphological structure and bacterial nutritional and reproductive methods.

Teaching difficulties: The structure of bacteria and its comparison with animal and plant cells. Speculations on the nutritional and reproductive modes of bacteria.

3. Collaborative exploration

(Complete the tutorial plan P43---44 Topic 1---Topic 3)

Theme one

1. Leeuwenhoek

2. Natural bacteria that already exist: lactic acid bacteria and yeast

Topic 2

1. (1) Very tiny, high-power microscope or electron microscope

(2) Rod-shaped, spherical, spiral-shaped

2. Capsule cell wall cytoplasm flagellum DNA cell membrane DNA nucleus

3. Bacteria are single-celled organisms.

4. Bacteria do not have chloroplasts in their cells and cannot carry out photosynthesis to produce organic matter. Most of them can only feed on ready-made organic matter.

5. Heterotrophic saprophytic bacteria can decompose the remains of animals and plants, decompose organic matter into simple substances, and return them to the soil. They are decomposers in the ecosystem.

Exploration Topic 1 The Discovery of Bacteria

1. The discoverer of bacteria: the Dutch ________, discovered in the late 17th century.

2. Proven by bacterial origin: Pasteur

Pasteur confirmed that bacteria were not produced by _____, but by ____________________. He also discovered _______ and _______, and proposed the pasteurization method, which is called "____________".

Exploration Topic 2: The morphology and structure of bacteria and their differences from plant cells

1. Size: Individual bacteria ________, and can only be observed with _______________.

2. Shape: There are _____, _____, _______ and other forms.

3. Structure

collaborative inquiry

1. Are spores the reproductive cells of bacteria? What is the reason?

Tip: Spores are not the reproductive cells of bacteria. Because one bacterium can only form one spore, and the spore can only germinate and form one bacterium, the number does not increase.

2. Bacteria are widely distributed in nature. What characteristics are related to them?

Tips: (1) The individual is tiny and easily carried by various media;

(2) Carry out fission reproduction, with fast reproduction speed and large numbers;

(3) It can form spores and has strong resistance to adverse environments. It can also float around and germinate into bacteria when placed in a suitable environment.

3. Bacteria can reproduce one generation every 20 to 30 minutes under suitable conditions. Please estimate the number of bacteria a bacterium will have after a day and night under suitable conditions. In fact, bacteria reproduce much slower than this rate. Do you know why?

Tips: 1×248～1×272 pieces. Because they cannot get suitable living conditions.

5. Knowledge consolidation

1. Some bacteria form ( ) when the environment is harsh to resist the bad environment

A. Capsule B. Spore

C. Spores D. Seeds

2. In the hot summer, food is prone to spoilage. This phenomenon cannot be explained ( )

A. The growth of bacteria depends on sunlight. B. Bacteria exist on the surface of food.

C. Higher temperatures are conducive to the growth of bacteria D. There is mold on the surface of food

3. The nutritional method of bacteria that absorbs ready-made organic matter from living organisms to maintain life is ( )

A. Saprophytic B. Autotrophic

C. Parasitism D. Symbiosis

4. Compared with onion epidermal cells, bacterial cells lack structures ( )

A. Cell wall B. Cell membrane

C. Cytoplasm D. Formed nucleus

5. The reproductive mode of bacteria is ( )

A. Spore reproduction B. Fission reproduction

C. Mating and reproduction D. Natural occurrence

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For more information about the "Bacteria Bacteria and Fungi" PPT courseware, please click the Bacteria ppt Bacteria and Fungi ppt tab.

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Update Time: 2024-11-20

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

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