This looks like a lot of fun! I did something like it when I was younger bought we had different smells (They didn't smell good). What are the student's going to do exactly?
The students are going to be looking at and feeling and tasting the foods to try and guess what they are. They have nothing to do with the setup, it's more of them being hands on during the activity and also writing down their hypothesis while doing this. We thought the lemon would be especially fun since it has a sour taste =]