I'd start with having them explore a bean from their own pantry (and if they don't have any, a bag of lentils or great northerns can be split among a class very cheaply). Then have them spout it and watch what happens. You can add in all kids of variables, as well as have them draw the bean at regular intervals and share that
I'd also look at the NSTA learning center https://learningcenter.nsta.org/search/ for additional ideas
Anne
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