Orla,
the demonstration of the flowers changing colour is a great introduction to some key ideas of how plants take in water. In inquiry learning as we are using the term in this course, the children should be using their own science understanding to predict an outcome and then verify their science by carrying out an investigation activity.
When the children make predictions there needs to be some reason behind their predictions. If they have to guess, then the inquiry process isn’t being fully used. This means that some initial discussion and elaboration of idea needs to happen – this can be in the wonder and explore section of the Framework.
I’d modify this lovely activity to show an example of a flower changing colour, then allow the children to set up more flowers, with perhaps the split stems and different colours in the jars to see how their ideas of the water movement are correct.