Required practical 5 Flashcards
Dissection of animal or plant gas exchange system or mass transport system or of organ within such a system.
Describe precautions that should be followed when performing a dissection
● Cover any cuts with a waterproof dressing
● When using a scalpel, cut away from body onto a hard surface
● When using a scalpel, use a sharp blade
● When using a scalpel, carry with blade protected / pointing down
● Wear disposable gloves and disinfect hands / wash with soap
● Disinfect surfaces / equipment
● Safe disposal - put gloves / paper towels / organ in a separate bag / bin to dispose
● If poisonous chemicals / toxins involved, work in a well ventilated environment
Suggest an ethical consideration when dissecting animals
● Morally wrong to kill animals just for dissection
● So use animals for dissection that have already been killed (humanely) for meat
Describe how you could prepare a temporary mount of a piece of plant tissue for observation with an optical microscope
- Add a drop of water to glass slide
- Obtain a thin section of specimen and place on slide
- Stain (eg. with iodine / potassium iodide to view starch)
- Lower coverslip at angle using mounted needle without trapping air bubbles
What are the rules of scientific drawing?
✓ Look similar to specimen / image, draw all parts to same scale / relative size
✓ No sketching / shading - only clear, continuous lines
✓ Include a magnification scale (eg. x 400)
✓ Label with straight, uncrossed lines
