Run experiments using different hydroponics systems. Create a computer Hypercard stack or video of your experiment and explain the procedure, data and results. It is helpful for students to already be familiar with plant life cycles and the parts of a plant. Roots also stabilize the plant, and keep it from being blown or washed away. To be valid, experiments must test a single variable by comparing against the standard or control.
Leaves grow out of the stem.
Students propose a hypothesis and design an experiment to test their hypothesis. They predict what will happen when a single plant growth condition is changed. Students conduct an experiment. Using a hydroponics system they've built, they plant seeds and compare their control plants against the experimental variable. The scientific method of proposing hypotheses, designing and carrying out experiments and drawing conclusions based on their results.