What Happens to Water Pulled Up Through Plant Roots?
Take a small, green broad-leafed plant or a twig with ten or more green leaves and immediately seal it in a zip-top bag OR seal the end of a leafy branch in a zip top bag without cutting the branch off the tree. Place the bag in the sun or near a very sunny window. (Fluorescent lighting will not work). Tell students they will observe the specimen again, after rotating through the labs. Invite them to predict what changes will be observed by the end of class.