Focus Question: HowFocus Question: How
can you test the amountcan you test the amount
of sugar in a substance?of sugar in a substance?
Investigation 3 - Part 3Investigation 3 - Part 3
• Why do people eat food?
• How do your cells get energy from the food
• How to plant cells get the energy they need?
• What happens during cellular respiration?
• Selection of different breakfast cereals
– Do you think they might contain sugar?
– Which one has the most sugar and which has
– Can you design an investigation to find out?
• 3 minutes - talk in groups to outline an
investigation for testing the cereals for
• Test 2 cereals
– Possible “high sugar” and “low sugar”
– Mrs. L will test control with 3 gr pure sugar
• Amounts per bag
– 2 spoons yeast
– 3 grams cereal
– 50 ml water (40-50ºC)
• Measure CO2 @ 10 min. & 20 min
• Write up plan on Sugar Test A
• Record CO2 levels on Sugar Test B and
class chart @ 10 min. & 20 min.
• Evaluate Results
– Yeast breaks down sugar for energy
– Produces carbon dioxide as waste
– The more sugar: The more carbon dioxide
• Rank cereals and write conclusion
• I-check 3 on Thursday
• Start reviewing for Living Systems Unit
test – March 5th
Sugar and Cells
• What does chlorophyll do?
• What raw materials do plants use to
• Why do plants make sugar?
• What happens to sugar when it is used
• How do your cells obtain energy from
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