Students must design their own lab to prove that plants go through photosynthesis in the light. Students are given plants, light sources, flasks, BTB, straws, etc. and they must design a test to prove plants produce oxygen in the light. Students must create their own data table and also design a control. This lab can be used by splitting the class and using the cellular respiration lab to show the cycle of energy into and out of plants and how it flows.