"Plant Cells" Cells are the basic units of life activities PPT courseware 6

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"Plant Cells" Cells are the basic units of life activities PPT courseware 6

1. Experimental purpose

1. Make a temporary transfer of plant cells.

2. Learn the basic methods of making temporary transfers.

3. Understand the basic structure of plant cells.

4. Practice drawing cell structure diagrams.

2. Experimental materials

Onion scale leaves, water, dilute iodine solution, tweezers, blade, dropper, gauze, absorbent, slide, cover slip, microscope.

step one:

Wipe the slides and coverslips clean with clean gauze.

Why wipe it clean?

Answer: In order to make the observation clearer and avoid interference with the plant cells to be observed.

Step 2:

Place the slide on the experimental table and use a dropper to place a drop of water in the center of the slide.

Step three:

Use tweezers to remove a small piece of transparent film - the inner epidermis - from the inside of the onion leaf. Dip the torn off inner epidermis into water drops like a glass slide and flatten it out with tweezers.

think about it

1. Why take the inner side?

Answer: Because what is being observed is the epidermal cells inside the leaves.

2. Why do you need a small piece, and the thinner the better?

Answer: It is helpful for clear observation and avoids the overlap of several layers of cells.

3. Why should it be flattened?

Answer: Avoid overlapping of several layers of cells.

4. Experimental analysis

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

Answer: Staining can display the structure of cells more clearly, but dyes often have a great impact on the biological activity of living cells, and sometimes are even fatal. When observing living cells and their biological activities, unstained temporary mounts should be used.

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

Answer: Generally speaking, bubbles appear as darker images with wider edges in the microscope field of view. They are round or oval in shape, and are often blank inside. Press the coverslip gently with the tip of the tweezers and the bubbles will deform or move.

3. A stain appears in the microscope field of view. Do you have any method to determine whether the stain is on the objective lens or the eyepiece?

Answer: You can first turn the eyepiece to see if the stain in the original position of the field of view moves accordingly. If it moves along, the stain is on the eyepiece. If the stain is on the objective lens, move the film and the stain will not move.

6. Experiment report

1. Select one of the cells you see under the microscope and draw it in your notebook, paying attention to its shape and structure (be realistic and don’t add details).

2. What are the structures of plant cells?

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"Plant Cell Structure and Function" PPT courseware:

"Plant Cell Structure and Function" PPT Courseware Part One Content: Experimental Observation Observation: Structure of Onion Scale Leaf Epidermal Cells 1. Precautions for making temporary glass specimens: ⑴ An appropriate amount of water should be dropped in the center of the glass slide, 1 to 2 drops Just enough, not too much. ⑵..

"Plant Cell Structure and Function" PPT:

"Plant Cell Structure and Function" PPT Part One Content: Classroom Activities Activity 1: Observation Experiment Observation: The structure of onion scale leaf epidermal cells Experiment purpose: Identify the basic structure of plant cells Experimental equipment: microscope, slide, cover glass, tweezers,..

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

"Plant Cells" Cells are the basic units of life activities PPT courseware 5 Teaching objectives 1. Knowledge objectives Learn how to make temporary mounts and clarify the basic structure of plant cells; 2. Ability objectives (1) Try to make temporary mounts yourself. (2) Use microscopy...

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Update Time: 2024-11-01

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

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