"Plant Cells" Cells are the basic units of life activities PPT courseware 5

Description

"Plant Cells" Cells are the basic units of life activities PPT courseware 5

teaching objectives

1. Knowledge goals

Learn how to make temporary slides and clarify the basic structure of plant cells;

2. Capability goals

(1) Try to make your own temporary mounting film.

(2) Use a microscope to observe biological cells

(3) Try to draw a simplified structural diagram of a plant cell.

3. Emotional goals

(1) Cultivate good experimental habits and a pragmatic scientific attitude;

(2) Exercise students’ innovative thinking and cultivate the spirit of having the courage to question and try reforms;

(3) Experience the fun of expressing, communicating and cooperating with others.

1. Preparation of temporary assembly of epidermal cells in onion scale leaves

Production steps

1. Wipe the slides and coverslips clean with clean gauze.

2. Place the slide on the test stand and use a dropper to drop a drop of water in the center of the slide.

Use tweezers to remove a small piece of the transparent membrane inner epidermis from the inside of the onion scale leaf.

Dip the torn off inner epidermis into the water droplets on the slide and flatten it with tweezers.

Use tweezers to pick up the cover slip so that one side of it touches the water droplets on the slide first, then slowly lower it down and cover the material to be observed.

Use your brain

Please use seven words to summarize the production process of temporary assembly of epidermal cells in onion scale leaves:

Wipe → drip → tear → unfold → cover → dye → absorb

1 Wipe: Wipe slides and coverslips

2 drops: Use a dropper to place a drop of water in the center of the slide

3 Tear: Use tweezers to tear off a piece from the inner epidermal leaf of the onion scale.

4 Exhibition: Flatten and place in the center of the water droplet

5 Cover: Cover the cover slip and gradually lower it from the water droplet side to prevent bubbles from forming.

6 Staining: Put a drop of iodine solution on one side of the coverslip

7 Aspiration: Use absorbent paper to aspirate from the other side of the coverslip to allow the dye solution to infiltrate the specimen.

1. How to draw a biological diagram well? What are the precautions?

(1) The size of the picture should be appropriate, and the position on the paper should be moderate, generally slightly to the upper left, so that there is room for notes and the name of the picture on the right and bottom;

(2) First use a sharpened pencil to lightly draw the outline based on the observed object image, then modify it and then formally draw it. Be sure to make the image realistic;

(3) The darker areas in the picture are represented by adding fine dots with a pencil (the darker the place, the more fine dots. Do not use shading to indicate dark areas);

(4) The words should be placed on the right side of the painting as much as possible. Use a ruler to draw horizontal indicator lines, and then make notes;

(5) Write the name of the drawn figure below the picture. As shown below:

practise:

1. When making temporary mounting slides, what impact will staining have on the cells? Under what circumstances should unstained temporary mounts be used?

It will have a great impact on the biological activity of living cells and sometimes even be fatal.

Therefore, unstained temporary mounts should be used when observing living cells and their biological activities.

2. How to distinguish cells and bubbles in the microscope field of view?

Generally speaking, bubbles appear as images with darker, wider edges in the microscope field of view, and are round or oval in shape. There is often a blank inside. Press lightly with the tip of tweezers, and the bubbles will deform or move.

3. A stain appears in the microscope field of view. Is there any way you can tell whether the stain is on the objective or the eyepiece?

Move the slide while observing. If the dirt moves with it, the dirt is on the slide;

Move the eyepiece while observing. If the dirt moves with it, the dirt is on the eyepiece;

If you have tried all the above and the dirt does not rotate, then the dirt is on the objective lens.

4. Juice can be obtained by squeezing fruits. Which part of the cell structure does this juice mainly come from?

Mainly from the cell fluid in the vacuole.

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Update Time: 2024-09-05

This template belongs to biology courseware People's Education Edition seventh grade biology volume 1 industry PPT template

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