ROLE OF WATER -

1. In general water constitutes 60-90% of protoplasm. Average 80%.
2. It forms 2/3 of human body weight, i.e. 66.66%.
3. Due to electrophillic nature of O, water is a polar molecule.
4. May participate in reaction after broken into H⁺ & OH^-.
5. 95% of water present in free state & 5% in combined state.
6. 20-21 lit. of water present in human body.
7. 15 lit. in ECF (Extra cellular fluid).
8. Water is site of origin of life.
9. It gives liquid medium for all vital activities.
10. Habitat for aquatic animals & plants.
11. Raw material in photosynthesis.
12. Helpfull in temperature regulation.