"Tiny World and Us" Tiny World PPT Courseware 3

Description

"Tiny World and Us" Tiny World PPT Courseware 3

Pasteur discovered that infectious diseases are caused and spread by microorganisms and invented the pasteurization method, which is widely used in the dairy and wine industries. Used to kill bacteria in liquids.

Fleming invented penicillin, which saved people from dying of disease.

The results of human exploration of the tiny world:

antibiotic:

Antibiotics are metabolites or synthetic analogs of microorganisms that can inhibit the growth and survival of microorganisms in vitro without causing serious side effects on the host. In fact, they can not only kill bacteria, but also kill mold, mycoplasma, chlamydia and other pathogens. It also has good inhibitory and killing effects on disease microorganisms.

Over the years, people have continuously invented and developed many drugs to resist and subdue the harm of various diseases. Plague, tuberculosis, septicemia, cholera, dysentery, typhoid and smallpox have all been conquered.

food industry

Through research, people know that some microorganisms are beneficial to humans, and using them can improve our lives. For example, making soy sauce, vinegar, molded tofu, pickles, dairy products, bread, steamed buns, wax meat, etc. all rely on microorganisms.

Agriculture and forestry

Yuan Longping's hybrid rice cultivation requires the use of magnifying glasses and microscopes. Hybrid rice is carried out on the stamens of rice flowers. The flowers of rice are very small, so looking for male-sterile wild rice and conducting hybridization work are both difficult. Magnifying glasses and microscopes must be used. The successful cultivation of hybrid rice has not only solved the food problem of our people to a large extent, but also is a magic weapon to solve the global food problem in the 21st century.

View and communicate

Human beings have made many achievements in exploring the tiny world. The exploration and discovery of the microscopic world has also led to the emergence of terrible weapons and pollution that threaten humans and the entire earth. While humans enjoy the joy of discovering new worlds, they are also facing greater new dangers. Atomic bombs, genetic weapons, man-made viruses, artificially modified genes, etc. will all have a huge impact on human life. In the tiny world, there is a lot of energy hidden. Once released, it can both benefit and destroy mankind.

Class summary

1. Due to the improvement of observation tools, the scope of human observation has been expanded, and many secrets of nature that cannot be discovered by the naked eye have been discovered.

2. The results of human exploration of the tiny world have promoted the development of science and technology, social progress and the improvement of human life.

3. Able to access relevant information according to the learning topic, and organize, classify and communicate.

Class test

1. Judgment questions:

1. Bacteria and viruses are harmful to humans. ( )

2. Cholera, tuberculosis, typhoid and other terrible diseases are caused by microorganisms. ( )

3. Microorganisms in pond water move quickly and we cannot observe them with a microscope. ( )

4. Microorganisms not only cause fresh food to spoil and become moldy, but are also the culprits that cause typhoid fever, plague, and cholera, so we must work hard to understand all microorganisms. ( )

5. Microorganisms, like animals and plants, can also carry out life activities such as respiration, digestion, excretion, and reproduction. ( )

2. Multiple choice questions:

1. An instrument that can observe both bacteria and viruses is ( )

A.Electron microscope B.Optical microscope C.Magnifying glass

2. The conditions for steamed buns to become moldy are ( )

A. Warm, dry B. Cold, dry

C.cold, damp D.warm, damp

3. The inside of steamed buns and bread are loose and porous because ( ) is kneaded into them.

A.Sugar B.Carbon dioxide C.Yeast D.Yeast

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"Tiny World and Us" Tiny World PPT Download:

"Tiny World and Us" Tiny World PPT Download Part One: Review and Summary How have human observation tools developed from ancient times to the present? How do people expand their observation horizons? ... ... ... Tiny World and Us PPT, Part 2...

"Tiny World and Us" Tiny World PPT:

"Tiny World and Us" Tiny World PPT Part One Content: Review and Summary Review the learning content of this unit, think about how human observation tools have developed from ancient times to the present, and how people's observation horizons have expanded. Let's talk about two relationship between them. ..

"Tiny World and Us" Tiny World PPT Courseware 4:

"Tiny World and Us" Tiny World PPT Courseware 4 Review and Summary Review the learning content of this unit and think about how human observation tools have developed from ancient times to the present. People can only use the five sense organs of eyes, ears, nose, tongue, and hands to explore the world. At that time,...

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Update Time: 2024-07-05

This template belongs to science courseware Science Edition for Sixth Grade Science Volume 2 industry PPT template

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