Contents of the sieve tube members makes up the continuous liquid system 2. Water and solutes move together as one mass in the sieve tubes along their length 3.
Glucose diffuses to the bundle sheath along the vein c.
Thus the phloem sap moves from areas of high pressure to areas of low pressure B. Direction of flow 1. Depends on where the active sink sites are of the plant 2. Can go up or down depending upon where the sink is 3. Sucrose is the principal substance transported 4. Rates at which products are added and removed from the system a. Products can only be removed from the system as fast as they are put in b. Products can only be put into the system as fast as they are being removed 2.