Answer: Capillary action
Explanation: The capillary action of the water allows it to climb up the trees. The capillary action is the phenomenon seen in the water or other liquids that allows it to move through a tube.
There are two types of forces acting in water, cohesion and adhesion. The adhesion can be defined as the movement of the water with other molecules.
Cohesion of water can be defined as the force of attraction between water molecules.
When the force of adhesion is more than cohesion it leads to the movement of liquid in capillaries.