Some experts say that leaves draw the water up stems and trunks; most other experts say that the roots pump it up. Do the following to see with whom you agree?
 
  1. You know that when you place a white flower in food coloring the dye soon is seen in the petals.
  2. What if the stem didn't have the flower on it: would the dye still rise in the stem?
  3. What if you had put the flowerless stem in the dye upside down?
  4. What if you compared dyes with and without sugar in them?

For more details:
www.science-projects.com/Stems.htm