Translocation of carbohydrates mostly takes place in the form of

Translocation of carbohydrates mostly takes place in the form of Sucrose.
In plants, sucrose is the major transport form for photo-assimilated carbon and is both a source of carbon skeletons and energy for plant organs unable to perform photosynthesis.
As a molecule translocated over distance, sucrose has to pass through several membranes. It is transported around the plant in phloem vessels.