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"Use a microscope to observe the living world around you (1)" Tiny World PPT Courseware 2
The invention of the microscope made it possible to observe very small objects as well as the fine structures of objects.
Have you heard of cells? What do we know about cells?
We also use microscopes to observe living organisms to see if we can observe cells.
In 1663, the British scientist Robert Hooke made a very remarkable discovery. He used a homemade compound microscope to observe the structure of a cork sheet and found that they looked like small rectangular rooms, so he named them cells.
Observe onion epidermal cells
Preparation before observation
There are certain requirements for observing objects under a microscope. The object must be prepared as a slide specimen before its fine structure can be observed under a microscope.
Observe the onion skin carefully with the naked eye, a magnifying glass, and a microscope, and write down what you see on the record sheet. Compare the images observed three times. What are the differences?
The small room-like structures we observe on the onion epidermis are onion cells.
Communicate and show the cells of the onion epidermis that everyone has drawn. What else can we discover?
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