1. Which cells in a tree are living and which are nonliving? What adaptations allow trees to be the oldest and largest organisms on Earth?
2. Identify the similarities and differences among canker diseases, vascular wilts, and wood decay of trees in terms of how each pathogen invades the tree, what symptoms should be expected, and what tissues will be affected.
3. If you have a beloved tree in your yard, what can you do to help it stay healthy and avoid disease? What factors make the life of an urban tree so difficult?
4. How can you tell by looking at a parasitic plant if it is a xylem parasite or a parasite of both the xylem and phloem? In the past, why were so many parasitic plants thought to have mystical powers?
