Focus Question: How Focus Question: How can you test the amount can you test the amount of sugar in a substance?of sugar in a substance?

Investigation 3 - Part 3Investigation 3 - Part 3

Cellular Respiration Questions

• Why do people eat food?

• How do your cells get energy from the food you eat?

• How to plant cells get the energy they need?

• What happens during cellular respiration?

Testing Cereals• Selection of different breakfast cereals

– Do you think they might contain sugar?– Which one has the most sugar and which has

the least?– Can you design an investigation to find out?

• 3 minutes - talk in groups to outline an investigation for testing the cereals for sugar content

Plan• 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

Testing• 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

Homework• 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 make sugar?

• Why do plants make sugar?

• What happens to sugar when it is used in cells?

• How do your cells obtain energy from the Sun?