This week my team and I had a Plant Project on carnations and food coloring, where we put the carnations in veil's then watered them with food coloring. My claim was that 50% or less of the stem would turn blue and/or red. My evidence was that our results came out to be that the plants died at the end with little color on the stems, and the tips of the flower, all of our predictions were wrong. My research was, vascular plants have plant tissues, which circulate resources through the plant. This feature allows vascular plants to evolve to a larger size then non-vascular plants, which lack these specialized conducting tissues and are therefore restricted to relatively small sizes.
Wright, Jacob J. "Do Flowering Plants Have Vascular Tissue?" EHow. Demand Media, 30 Jan. 2011. Web. 30 Apr. 2012. http://www.ehow.com/facts_7870000_do-flowering-plants-vascular-tissue.html