List the steps associated with the pressure-flow model of phloem transport.

1.Sugars are produced in the source (leaves)by photosynthesis. 2.Sugar is actively transported into the sieve tubes. 3.Water moves into the sieve tubes by osmosis. 4.Sugar and water mix to form phloem. 5.Phloem follows positive pressure and moves towards the sink (root system). 6.Sugar is stored in the sink. 7.Cells use the sugar for cellular respiration. 8.Water exits by osmosis and returns to the xylem.