Compare transpiration and translocation, and be sure to cover the five points below.
1. Principal substance(s) transported

2. Direction of transport

3. Tissue through which transport occurs

4. Name of model that explains the process

5. Does the plant expend energy to carry out the process?

1. Transpiration: water and minerals; translocation: dissolved sugars
2. Transpiration: upward; translocation: both upward and downward
3. Transpiration: xylem; translocation: phloem
4. Transpiration: tension-cohesion (or transpiration-cohesion) model; translocation: pressure-flow model
5. Transpiration: no; translocation: only to load/unload sugars