Water is indispensable for life.

Question:

Water is indispensable for life. What properties of water make it useful for all biological processes on the earth?

(a) Water is a polar solvent due to which it is regarded as the ‘universal solvent’.

(b) Water has a high specific heat capacity.

(c) Water has low viscosity and high surface tension.

(d) The density of water decreases below 4◦C.

(e) Capillarity of water

Solution:

(a) All the essential substances in living organisms are solutes dissolved in water and transported from one place to another.

(b) Specific heat is the amount of heat required to increase the temperature of one gram of matter by one degree rise in temperature

(c) Surface tension is the cohesion of the water molecules on the fluid surface of occupying the least volume. Viscosity is the resistance of a fluid to flowing water.

(d) Water expands when its temperature becomes lesser than 4◦C. This decreases its density and making ice float.

(e) Water rises in capillary tubes which is a property that helps transport of water from roots of the plants to other parts of the plant.

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