2. Have the students investigate the process by which plants get their nutrients by having them perform an experiment growing plants in different types of soils, one with a lot of nutrients, one with little nutrients. They could also do the experiment at the following link to investigate the depletion of soil nutrients as plants grow: http://www.pbs.org/saf/1301/teaching/teaching2.htm
3. Have the students taste different things without their nose. You will need to do this in groups. Bring a blindfold and pieces of foods with different flavors, but with similar textures (i.e. pear/apple, different kinds of bread, baby foods, jelly beans, vegetables, etc.). Have one student blind fold another. Have the blindfolded student hold their nose as another student gives the two similar food samples. Have a third student keep a record of the results. Have the class compare results and discuss.