The movement of carbohydrates from the leaves of the tree to the root is primarily a function of the

Starch is insoluble in water,yet it is accumulated in large quantities in potato tuber because

Analogy type questions:
$(1)$ In Xylem : Vessel :: In Phloem : ..........
$(2)$ Synthesis of food : Source :: Regions of need : ...........

Which structure of the phloem creates a pressure gradient in the sieve tube?

The phloem sap is mainly composed of:

Glucose produced by photosynthesis is converted into sucrose,then moved into the companion cells and then into the living phloem sieve tube cells by........