"Use a microscope to observe the living world around you (2)" Tiny World PPT Courseware 4

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"Use a microscope to observe the living world around you (2)" Tiny World PPT Courseware 4

Steps to prepare onion epidermal slide specimens:

1. dripping water

2. Cut the onion and remove the skin

3. Take the epidermis and put it into the water drops

4. Place the coverslip

5. Drops of iodine

6. Water absorption

When we move the slide while observing the specimen, what do we find?

The direction of movement is exactly opposite to the direction viewed through the eyepiece.

How is the magnification of a microscope calculated?

The magnification of the eyepiece multiplied by the magnification of the objective lens. For example, if the eyepiece is 10 times and the objective lens is 10 times, the microscope can magnify 100 times.

A large number of research facts show that living organisms are composed of cells.

The establishment of the cell theory is hailed as one of the three major discoveries in natural science in the 19th century.

Two other major discoveries in natural science in the 19th century were:

biological evolution

Law of conservation and transformation of energy

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Update Time: 2024-10-21

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