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Jumat, 14 Maret 2008

OBSERVING ONION CELLS

OBSERVING ONION CELLS

Cells are very tiny and cannot be seen with our naked eyes. Cells of living organisms can be observed a microscope. How shape and structure of onion cells !

Materials and apparatus:


1. Onion

2. Iodine solution

3. Glass slide

4. Cover slip

5. Filter paper

6. Mounting pin

7. Razor blade/ knife

8. Dropper

9. water

What to do

1. Place a small piece of the thin skin from the inside of an onion on the microscope slide

2. Use a dropper to place one or two drops of water or dilute iodine solution on the sample

3. Hold a clean cover slip by the edges and place it at one edge of the drop of water. Slowly lower the cover slip onto the drop of water until it lies flat. Avoid trapping air bubbles.

4. If you have too much water or a lot of air bubbles, touch the edge of paper to the edge of the cover slip to draw off extra water and force air out.

5. Try to observe your specimen under the microscope.

6. Draw the cells which you see under the microscope in the place provided below

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