The property of polarity helps the water molecules to stick together by a force called cohesion. Polarity also helps water molecules to bind with molecules of other substances through a force called adhesion. You may have observed in your chemistry experiments that water rises up in a tube, that is called capillary action. This is due to its property of adhesion, that is, attraction between unlike molecules. Therefore, polarity, cohesion and adhesion is very important for life. Water can not only bind to water molecules, but also other molecules that helps in transportation of water up in the trees through tiny tubes called the 'xylem vessels'. This makes water polarity important for living things.

The hydrogen bonds are not as strong as covalent bonds. But these bonds are strong enough to bind water molecules together. You should always keep in mind the two most important characteristics of water. The first characteristic due to polarity is the ability to dissolve any substance and the next characteristic is the low density of water in its frozen state.
(Writen by Batul Nafisa Baxamusa)