As part of our plant unit we have been doing a series of experiments to demonstrate the ‘jobs’ that each part of the plant has in the healthy growth of the whole plant. This experiment showed the role of the ‘stem’.
We put a stalk of celery and a white flower into a jar with blue food-coloured water. The next day we noticed quite the difference! Students learned that the job of the stem is to suck the water up from the roots to share it with the rest of the plant. The addition of the blue food colouring showed that this process took place in our experiment.