Leave a white flower in food dye to colour the petals. The dye traces out the xylem vessels in the stem and branching vessels in the petals of the flower.
Science content (2016 curriculum):
Biology: Features, Adaptations of Living Things (K, 1, 3, 7)
Science topic (2005 curriculum connection):
Life Science: Needs of Living Things (grade 1)
Life Science: Plant Growth and Changes (grade 3)