20 MINUTES in the morning, 5 MINUTES in the afternoon
Today, the teacher will do a hands on lesson called celery rocks to demonstrate how pesticides get into our food. It is a good idea to do this lesson in the morning so the effects can be observed in the afternoon.
materials: celery stalks (one for every two students), 16 oz paper cups (one for each celery stalk) red or blue food coloring, waterleave the celery stalks in the water in an out of the way place when the lesson is completed.
Revisit the celery 4-5 hour later. Have students make observations about what has happened to the celery. What do we think might be in the celery if the water is the same water with the pesticides in it from yesterday’s lesson? Have students write their observations in their Observation Journals.