Modeling the Inputs and Outputs of Photosynthesis and
Cellular Respiration
PART 1: Observing indicator color change
1. Before blowing into the indicator solution, what color is it?
2. What did you notice about the color of the solution after you blew into it using
the straw?
3. What might explain the change in color? What are you blowing into the solution that
could cause a color change?
4. Draw a model of what you think happened in the indicator solution. Include relevant
details, labels, and arrows to indicate changes that happen in the system.5. Discuss and share ideas with your classmates about what might explain the change
in color. After discussion, draw a revised model that includes any new information
you learned