Phloem also known as food transportation in plants is from one place to another in a process known as translocation. - This is made possible by what is termed the pressure-flow theory. Sugars mainly sucrose are produced at the sites of their Photosynthesis (source) and are made to move into the phloem. - To achieve this, a high solute in the phloem should exist. Thus, water will move into the phloem from the xylem directly surrounding it by osmotic pressure. This pressure difference always moves the sugar solution towards the plus (roots, fruits, and storage organs). - Sugars are removed for consumption or storage at the plus and water also leaves the phloem which reinforces the flow progression.