Question 34
Safety adaptation for this resource: use teacher-provided dated photographs, or only teacher-approved samples kept securely sealed in designated school storage. The source method is for reading and planning, not unsupervised culturing. Do not open, smell, touch or taste mouldy samples. The teacher handles disposal; never store them with food for eating.
Source method:
Investigating how temperature affects decay by microorganisms
Doing this investigation will give you practice in carefully collecting results and using them to make a conclusion.
You will need: 2 similar pieces of bread, 2 paper plates, 2 plastic bags or some transparent food wrap, a dropper pipette, safety glasses.
Safety: Wear safety glasses when you look at the bread in step 5. Do not uncover the bread when you look at it.
1. Put two similar pieces of bread onto two paper plates.
2. Add a little water to both pieces of bread. Take care not to get them too wet.
3. Leave the bread open to the air for about 30 minutes. Then cover each plate with a plastic bag or food wrap.
4. Put one plate in a warm place. Put the other plate in a refrigerator.
5. Record the appearance of each piece of bread each day, for several days. Do not uncover the bread, as you do not want to breathe in any mould spores.
Source method:
Investigating how temperature affects decay by microorganisms
Doing this investigation will give you practice in carefully collecting results and using them to make a conclusion.
You will need: 2 similar pieces of bread, 2 paper plates, 2 plastic bags or some transparent food wrap, a dropper pipette, safety glasses.
Safety: Wear safety glasses when you look at the bread in step 5. Do not uncover the bread when you look at it.
1. Put two similar pieces of bread onto two paper plates.
2. Add a little water to both pieces of bread. Take care not to get them too wet.
3. Leave the bread open to the air for about 30 minutes. Then cover each plate with a plastic bag or food wrap.
4. Put one plate in a warm place. Put the other plate in a refrigerator.
5. Record the appearance of each piece of bread each day, for several days. Do not uncover the bread, as you do not want to breathe in any mould spores.
