This is a wonderful flower matching game. For preschoolers, this would need to be a small group activity instead of an individual activity so that reading help could be given to the child. This is a great way to re-enforce the parts of a plant.
In this recycling lesson plan, students do an outdoor science experiment with trash. This is powerful hands on science experiment for teaching recycling to students and the reason we recycle. Excellent for Kindergarten through third grade.