Importance Of water in living Organisms:-
Water is very important in life. It is the medium of life.It is most abundant inorganic compound in living organisms. Its percentage different from 65 to 89 in different organisms. Human tissues contain water about 20% water in bone cells and 85 % in brain cells.
It can be defined as "calories absorbed per gram of water vaporized". Due to presence of hydrogen bonding water needs lots of energy to change its form from liquid to gas. The heat of vaporization of water is 574 Kcal/kg, which play a very important role maintain the heat produced by oxidation. It provide cooling effect to plants when water transpired, to animals when water respired.
3: Diffusion: It can be define as " the movement of molecules from higher concentration to the area of lower concentration. Water diffuses not only itself but also causes the diffusion of ions and molecules of other substances dissolved in it. Diffusion cause equal distribution of molecules.
4: Organize non-polar molecules:
Non- polar molecules such as oil do not form hydrogen bonds with water. it means non-polar molecules move away from the water molecules so they can be refer as "hydrophobic" which mean water fearing. The non-polar molecules form bond with each other in a water solution and become organized. 5: Protection:
Water is a very effective lubricant that gives protection against damage result from friction i.g.tears protect surface of eyes from the rubbing of eyelids. Water is fluid cushion around organs that helps to protect them from damage.
6:Ionization of water:
Water is slightly ionizing compound since it ionize to the extent of about one in 550million molecules. The water molecules ionize to form H ion and hydro Oxley ion. This reaction is reversible but equilibrium is maintained.
7: Capacity of heat: The specific heat capacity can be defined as "the number of calories required to rise the temperature of 1g of water by 1 degree", The specific heat capacity of water is 1.0. It has a great ability of absorbing heat with minimum change in its own temperature. This due to hydrogen bonding in water molecule. It require lots of energy to break hydrogen bond. Due to this property water work as temperature stabilizer for living organisms. And also protect them against sudden changes in environment temperature.
Properties of water:-
1:Solvent:
For polar substances water is excellent solvent because of its polarity. When we dissolve ionic substances in water, dissociate into positive and negative ions. When we dissolve non-ionic substance into water it dispersed in water, because they having charged groups in their molecules. In solution ions and molecules move randomly and are in more favorable form to react with other molecules and ions. It is due to solvent property of water. That almost all reaction in cells take place in aqueous media. In cells chemical reactions are speed up by enzymes which need water for its proper function. Non polar molecules are insoluble in water such as fates, due to this characteristic it help to maintain membrane which make compartment in cell.
2: Heat of vaporization:It can be defined as "calories absorbed per gram of water vaporized". Due to presence of hydrogen bonding water needs lots of energy to change its form from liquid to gas. The heat of vaporization of water is 574 Kcal/kg, which play a very important role maintain the heat produced by oxidation. It provide cooling effect to plants when water transpired, to animals when water respired.
3: Diffusion: It can be define as " the movement of molecules from higher concentration to the area of lower concentration. Water diffuses not only itself but also causes the diffusion of ions and molecules of other substances dissolved in it. Diffusion cause equal distribution of molecules.
4: Organize non-polar molecules:
Non- polar molecules such as oil do not form hydrogen bonds with water. it means non-polar molecules move away from the water molecules so they can be refer as "hydrophobic" which mean water fearing. The non-polar molecules form bond with each other in a water solution and become organized. 5: Protection:
Water is a very effective lubricant that gives protection against damage result from friction i.g.tears protect surface of eyes from the rubbing of eyelids. Water is fluid cushion around organs that helps to protect them from damage.
6:Ionization of water:
Water is slightly ionizing compound since it ionize to the extent of about one in 550million molecules. The water molecules ionize to form H ion and hydro Oxley ion. This reaction is reversible but equilibrium is maintained.
7: Capacity of heat: The specific heat capacity can be defined as "the number of calories required to rise the temperature of 1g of water by 1 degree", The specific heat capacity of water is 1.0. It has a great ability of absorbing heat with minimum change in its own temperature. This due to hydrogen bonding in water molecule. It require lots of energy to break hydrogen bond. Due to this property water work as temperature stabilizer for living organisms. And also protect them against sudden changes in environment temperature.
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