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In kindergatren they study trees the first unit. In the unit they are asked what a tree needs to grow. The curriculum wants them to know that a tree needs air, water and sunlight.  I will then asked them what happen if we change any of those things, will all the plants grow the same. We as a class could set up each experiment and they could record their observations through drawings and simple sentences. When we finish I can ask them is there other things we can do to change our experiment. It is open to them, some might ask what if we add plant food,  what if we try sand, or if we grow them in front of an air-conditoner. I do believe that this lesson can have many extensions based on their own inquiry.