Flexi Says: Water has some unusual properties due to its hydrogen bonds. One property is cohesion, the tendency for water molecules to stick together. Cohesion causes water to have surface tension, the property that makes water molecules stick together and form droplets. Another important physical property of water is adhesion. In terms of water, adhesion is the bonding of a water molecule to another substance, such as the sides of a leaf's veins. This grip-like characteristic that water molecules form causes capillary action, the ability of a liquid to flow against gravity in a narrow space. Adhesion and capillary action are necessary to the survival of most organisms. It is the mechanism that is responsible for water transport in plants through roots and stems, and in animals through small blood vessels.
