Required practical 5 Flashcards

Dissection of animal or plant gas exchange system or mass transport system or of organ within such a system.

1
Q

Describe precautions that should be followed when performing a dissection

A

● 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

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2
Q

Suggest an ethical consideration when dissecting animals

A

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

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3
Q

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

A
  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
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4
Q

What are the rules of scientific drawing?

A

✓ 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

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