Problem 1: Why is it important to "blow" into the test tube before we begin the experiment?
Problem 2: Why did we need to have not one, but two control groups? What was the purpose of each?
Problem 3: Knowing that Photosynthesis heavily relies on the gases present for the plant to use, why was it important to ensure that each of the test tubes was capped shut?
Problem 4: Did photosynthesis happen in any of the test tubes, and how do you know?
Problem 5: What important aspect was missing in the control groups that automatically made it impossible for photosynthesis to happen?
Problem 6: Callie attempts to reproduce this exact experiment once more, except she wants to see what happens if you repeat Test tube #3 but rather leave it in the dark by wrapping foil around it instead of giving it a light source.
a. Do you expect there to be a color change?
Problem 7: Callie goes through her experiment, and gets the following results. Although Callie thinks she may have set her experiment up wrong, her lab instructor says she did everything perfectly and got the correct results. Explain why Test Tube #4 gave off the result it did even though it was left in the dark for 24 hours.