I do this over 2 lessons starting then High Grow task first - I give them a choice of soils, cotton wool, plastic bags and where to leave the dishes. The chemistry task - I give a boiling tube of acid + UI, a boiling tube of alkali + UI and 4 test tubes. The physics/engineering task - don't allow students to screw the paper in to balls. I discuss the science involved after each task. There are a few questions related to the tasks ate the end.
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