"Observe the living world around you with a microscope (1)" Download PPT of Tiny World

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"Observe the living world around you with a microscope (1)" Download PPT of Tiny World

Part One: Exploring the New Course

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.

(1) Observe onion epidermal cells

There are certain requirements for observing objects under a microscope. The object must be made into a slide specimen before its fine structure can be observed under a microscope.

Experiment name: Take the skin of onion

Materials needed: onion, knife, tweezers, glass slide

Steps to remove the skin: Cut the onion bulb in half, break off one piece, be careful not to remove the inner skin; then use a knife to lightly score the "#" character on the inner skin; use tweezers to tear off the skin in the middle of the "#" character.

(2) Composition of microscope

(3) Methods and steps for using a microscope correctly

(4) Onion epidermal structure observed under a microscope

Compare using the naked eye, a magnifying glass, and a microscope to observe the onion skin. What are the differences? Take good notes.

A magnifying glass can see more detail than the naked eye, and a microscope can see more detail than a magnifying glass, but the field of view (the range of sight) is much smaller.

Observe: The onion skin is composed of regular polygons.

The small room-like structures observed are actually the cells of the onion epidermis.

Use a microscope to observe the living world around you PPT, part 2: expansion and extension

Cells are the basic units of structure and function of organisms. The particularity of cells determines the particularity of individuals. Therefore, in-depth study of cells is the key to uncovering the mysteries of life, transforming life and conquering diseases.

Cell biology has become one of the fastest growing cutting-edge disciplines in contemporary biological sciences and is a required course for biology, agriculture, medicine, animal husbandry, aquaculture and many biological-related majors.

Use a microscope to observe the living world around you PPT, the third part of the content: one lesson, one practice

1. Fill in the blanks

1. The objects observed under the microscope must be thin and transparent. For thick objects that are difficult to observe, ( ) is required.

2. You can make it after getting the onion specimen ( ).

3. The steps to use the microscope correctly are ( ), ( ), ( ), ( ) and ( ).

2. Judgment questions

1. When removing the onion skin, mark a "#" character on the inner skin of the onion and gently tear it off with tweezers. ( )

2. American scientist Robert Hooke used a homemade microscope to discover cells in cork. ( )

3. You can see more details with a microscope, but the field of view is also smaller. ( )

Use a microscope to observe the living world around you PPT, Part 4: Class Summary

The finer structure of an object can be seen under a microscope. The onion skin is made up of cells.

homework

When you get home, draw the structure of the onion epidermal cells and label the names of each part.

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For more information about the PPT courseware "Use a Microscope to Observe the Living World Around You in a Tiny World", please click on the Tiny World ppt Use a Microscope to Observe the Living World Around You ppt tag.

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Update Time: 2024-06-08

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