"Use a microscope to observe the living world around you (3)" Tiny World PPT Courseware 2

"Use a microscope to observe the living world around you (3)" Tiny World PPT Courseware 2

Observe microorganisms in water

Since Leeuwenhoek discovered microorganisms with a homemade microscope, scientists have discovered through observation that there are many microorganisms living in nature.

Make specimens

Microorganisms can be collected by taking some pond or fish tank water.

Notice

If the microorganisms move quickly and are difficult to observe, we can first put a small amount of absorbent cotton fiber on the slide, then drop a drop of pond water on it, and cover it with a cover slip.

You can also use absorbent paper on the edge of the coverslip to absorb excess water to control the movement of microorganisms.

fill in the blank

1. We can also use ( ) to cultivate tiny organisms. The reason why the water in the fish tank turns green is the result of ( ).

2. The microorganisms I know include ( ), ( ), ( ), etc.

3. ( ) is the most basic functional unit of a living body. Life activities such as ( ), ( ), excretion, and development of organisms are all carried out through it.

judge

1. The bottled water we drink has been purified, so there are no microorganisms in it. ( )

2. Microorganisms are living organisms and therefore also metabolize. ( )

3. We can use hay to cultivate microorganisms. ( )

4. When making microbial slide specimens, we can control the movement of microorganisms by absorbing excess water. ( )

5. A drop of water in a pond contains many tiny organisms. ( )

What are the characteristics of living things?

Living things generally have six major characteristics:

1. Have a common material basis and structural basis;

2. All have metabolic effects;

3. Will respond to external stimuli;

4. All have growth, development and reproduction phenomena;

5. All have the characteristics of inheritance, variation and evolution;

6. They all adapt to a certain environment and can also affect the environment.

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