Biology
03. Preparation and scientific drawing of a slide of onion cells
- 01:15 What do air bubbles look like under the microscope?
- 01:32 What cell structures do you observe?
- 01:51 What units will you use to record the cell size?
microscope fitted with an eye piece graticule
microscope slide and cover slip
onion
paper towel
scalpel
white tile
mounted needle
iodine-potassium iodide solution
forceps
| Hazard | Risk | Control measure |
|---|---|---|
Iodine-potassium iodide solution - Irritant |
Contact with eyes and skin |
Eye: flood with tap water (10min) Skin: drench with water. Flood with tap water (10min) |
Microscope slide and cover slip - sharp if broken |
Cuts to skin |
Care when using so as not to break. If breakage occurs, sweep up and dispose of broken glass carefully. |
Scalpel |
Cuts to skin |
Cut downwards and away from body, onto a white tile |