Our year 10s have been learning about the wonders of plants and how their various chemical processes take place. In this session, we could see where in a leaf photosynthesis had taken place by how the iodine had reacted to the starch in the greener parts of the leaf turning the reagent from a orangey-brown to a blue-black colour. Lots of cross-subject links here that all the pupils appreciated. Here is a comparison between two identical leaves.
