It is probably more efficient to do so. Glucose in a monosaccharide whereas sucrose is a disaccharide and is twice the size. So, it's like carrying two bags of groceries on each trip instead of just one at a time. See? Get more done with little effort. ANd that seems to be a recurring theme in many natural processes.
glucose is more readily soluble ,so cannot be stored
Carbohydrates are moved about plants in the sieve tubesof the phloem.This movement of materials from one part of a plant to another is called translocation. Carbohydrate is normally translocated as sucrose. If you inject glucose or fructose into a plant, it will probably be converted into sucrose before translocation.
Glucose is transported as sucrose. It is non reducing and readily soluble.
Translocation is the transport of sugars throughout the plant. The phloem is responsible for this, and has sieve tube members and companion cells that connect via the plasmodesmata in order to transport the sugars.
"Phloem sap" is the product of photosysnthesis in the leaves - basic sugars like sucrose and glucose
Phloem transports sugars from the photosynthetic process to the rest of the plant.
Potato tubers make glucose by degrading sucrose (cane sugar). Sucrose is the end-product of photosynthesis and is transported from the leaves through the phloem to the tuber.
Xylem moves water upward and Phloem move food and nutrients downward to the roots.
* Because phloem is a soft tissue it can be easily taken into the body of the insects.* It is near to the surface area so insects can reach easily.* The phloem tissue carries food molecules such as sucrose, glucose and amino acid.
phloem
source to sink
they allow the sucrose to enter in phloem.
in the xylem and phloem respectivly