Like good scientists, kids often want to see first-hand why things are as they are; they can do just that in the starch-testing photosynthesis activity found here. Depending on the age of your pupils, you may wish to do the investigation as a demonstration or have lab partners work together to follow the carefully designed procedure. In order to perform the lab, there are some materials you will need to acquire if you do not have them in your storeroom, so read through the technical notes carefully.