topic 3 : Required practical 5

Question 1

Describe precautions that should be followed when performing a dissection

Answer 1

● When using a scalpel, cut away from body onto a hard surface
● When using a scalpel, carry with blade pointing down
● Wear disposable gloves and disinfect hands

Question 2

Suggest an ethical consideration when dissecting animals

Answer 2

● Morally wrong to kill animals just for dissection
● So use animals for dissection that have already been killed (humanely) for meat

Question 3

Describe how you could prepare a temporary mount of a piece of plant
tissue for observation with an optical microscope

Answer 3

1. Add a drop of water to glass slide
2. Obtain a thin section of specimen and place on slide
3. Stain (eg. with iodine / potassium iodide to view starch)
4. Lower coverslip at angle using mounted needle without trapping air bubbles

Question 4

What are the rules of scientific drawing?

Answer 4

✓ Look similar to specimen / image - draw parts to the same scale / relative size
✓ No sketching - only clear, continuous lines
✓ No shading / hatching
✓ Include a magnification scale (eg. x 400)
✓ Label with straight, uncrossed lines