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"Tiny World and Us" Tiny World PPT courseware
Review and Summary
Review the learning content of this unit, think about how human observation tools have developed from ancient times to the present, how people's observation horizons have expanded, and talk about the relationship between the two.
Eyes are people's main observation tools, but people's highest vision can only see tiny objects as small as 1/5 mm. For many years, it has been a dream of mankind to invent a tool that can see smaller objects.
As early as more than a thousand years ago, people invented the magnifying glass. Today magnifying glasses are widely used in our lives, work, and study. From observing with the naked eye to inventing the magnifying glass is a great progress for mankind.
A magnifying glass can magnify an object more times so that you can see the object more clearly. This was also the goal that people had been trying to pursue before the invention of the microscope.
But the magnification power of a magnifying glass is limited.
A magnifying glass can only see clearly things that are less than 1 mm in size and cannot be seen with the naked eye.
The results of human exploration of the tiny world
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 to kill bacteria in liquids.
Fleming invented penicillin, which saved people from dying of disease.
Over the years, people have continuously invented and developed many drugs to resist and subdue the hazards of various diseases, such as plague, tuberculosis, septicemia, cholera, dysentery, typhoid, and smallpox, which have all been slowly conquered.
Soil improvement and purification:
There are many microorganisms in the soil, mainly bacteria, fungi, actinomycetes, algae and protozoa. They are related to soil fertility. Some can decompose biological corpses into nutrients needed by plants, and some can live in symbiosis with organisms. Play the role of nitrogen fixation. For example, the many small balls growing on the roots of leguminous plants are rhizobia. The rhizobia absorb and fix nitrogen in the atmosphere and provide it to the plants as fertilizer. Recently, during the construction of my country's western development, some agricultural microbiology workers strongly advocated planting more leguminous trees and grasses in the western deserts, Gobi, and barren slopes to increase soil fertility, green barren hills and slopes, prevent soil erosion, and promote agricultural production. , forestry and animal husbandry development.
Consolidation exercises
1. Connection
MSG crystals
Microorganisms in river water can be observed with a magnifying glass
butterfly's tentacles
The cells of plant leaves can be observed with a microscope
plant seeds
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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,...