Advertisements
Advertisements
प्रश्न
Describe the usefulness of water in biosphere and biological systems.
Advertisements
उत्तर
Water is essential for all forms of life. It constitutes around 65% of the human body and 95% of plants. Water plays an important role in the biosphere owing to its high specific heat, thermal conductivity, surface tension, dipole moment, and dielectric constant.
The high heat of vapourization and heat of capacity of water helps in moderating the climate and body temperature of all living beings.
It acts as a carrier of various nutrients required by plants and animals for various metabolic reactions.
संबंधित प्रश्न
Arrange the following:
CaH2, BeH2 and TiH2 in order of increasing electrical conductance.
What properties of water make it useful as a solvent? What types of compound can it (i) dissolve, and (ii) hydrolyse?
Why is it said that-
Water is a universal solvent.
Why is it said that-
There is no alternative to water for cleaning purposes.
Explain the picture in your own words.
Explain the various properties of water.
Why is the density of seawater more than that of rain water?
Why should a glass bottle completely filled with water never be kept in a freezer?
Define the following.
Freezing point
Which of the following equations depict the oxidising nature of \[\ce{H2O2}\]?
If same mass of liquid water and a piece of ice is taken, then why is the density of ice less than that of liquid water?
Give reasons: Lakes freeze from top towards bottom.
Melting point, enthalpy of vapourisation and viscosity data of \[\ce{H2O}\] and \[\ce{D2O}\] is given below :
| \[\ce{H, O}\] | \[\ce{D2O}\] | |
| Melting point / K | 373.0 | 374.4 |
| Enthalpy of vapourisation at (373 K)/kJ mol–1 | 40.66 | 41.61 |
| Viscosity/centipoise | 0.8903 | 1.107 |
On the basis of this data explain in which of these liquids intermolecular forces are stronger?
Why does water show high boiling point as compared to hydrogen sulphide? Give reasons for your answer.
The freezing point of water ______ with an increase in pressure.
Pure water boils at ______ °C at one atmospheric pressure.
What is the taste of distilled water & boiled water?
What are the physical properties of pure water?
Which of the following ion is responsible for the temporary hardness of water?
The water having more dissolved O2 is ______.
