How do you prepare onion cells slides?

Answer 1

add ethanol onto the thin cell layer on the slide and watch under a microscope. the cell membrane moves away from the cell wall as the cell is becoming plasmolized and the red dye of the onion cell spreads as there is no longer a membrane to contain it

Answer 2

When I did the lab, I took just a bit of one layer of onion, put it on a slide and dropped a little iodine on it so you can see it better. I put a cover slip over it after that was done. Hope that helps!

Firstly take forceps then take out thin onion layer from it .place onion layer on the slide and drop some ink drops(atleast 3) on it for a clearer vision and then cover it with a cover slip

Answer 3

HUMAN EPITHELIAL CELLS

Epithelial cells cover the body's surface and line its cavities.

1. Obtain toothpick and sanitize it with alcohol.
2. Gently scrape the inside of yourcheek with the toothpick.
3. Place the scrapings on a clean, dry slide.
4. Add a drop of very weak methylene blue stain and cover with a cover slip.
5. Observe under the microscope, using the directions for focusing given above. Start with the scanning power objective to find some cells, and then observe under both low and high power.
6. Locate the cell membrane, the cytoplasm, and the nucleus.
7. Make a drawing of what you see. Be sure to label the drawing with what it is, and what power you were using when you made your drawing

PLANT CELLS

1. 1. With a scalpel or your fingers, strip a thin, transparent layer of cells from a piece of onion.
   2. Place it gently on a clean, dry slide.
   3. Add a drop of methylene blue stain and cover with a coverslip.
   4. Observe under the microscope and draw what you see. Be sure to label your drawing.
   5. Locate the cell wall. Is a nucleus visible?
   6. Count and record the number of cells across the diameter of the high power field, both lengthwise and side to side.
   7. Using the number you calculated in exercise 3, calculate and record the length and width of an onion cell in micrometers.
   8. Record some obvious differences between the human cheek cells and the onion cells.
   9. Record any similarities between the two types of cells.
   10. If there is time, obtain another plant sample, make a slide (without methylene blue, use water) and observe under the microscope.
   11. Draw what you see. Be sure to label your drawing.
   12. Record some differences and similarities between the different plant cells you observed.