Water is essential for life because of these reasons:
(i) It provides medium to carry out all the cellular processes.
(ii) All the reactions that occur in our body and within cells occur between substances that are dissolved in water
(iii) It is required for the transportation of materials from one part of the body to the other.
(iv) It helps to maintain body temperature.
(v) Water makes up about 70% of body weight of all the living organisms.
