Final answer:
Transpiration and capillary action are the two processes that help water move up the tubes of plants over great distances. Transpiration involves water evaporating from the leaves, creating a suction force, while capillary action enables water molecules to climb up narrow tubes like xylem vessels.
Step-by-step explanation:
The two processes that help water to move up the tubes of plants over great distances are transpiration and capillary action.
Transpiration is the process by which water evaporates from the leaves of a plant and creates a suction force that pulls water up through the xylem tubes. This helps in pulling water from the roots to the leaves.
Capillary action is the process by which water molecules are able to "climb" up narrow tubes due to their adhesive and cohesive properties. This action helps water to move up the narrow xylem vessels in plants against gravity.
Learn more about Water movement in plants