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प्रश्न
Describe the usefulness of water in biosphere and biological systems.
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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
Among NH3, H2O and HF, which would you expect to have highest magnitude of hydrogen bonding and why?
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.
State whether the following statement is true or false.
The substance in which a solute dissolves is called a solvent.
Explain the picture in your own words.
Why is the density of seawater more than that of rain water?
Define the following.
Boiling point
Which of the following equations depict the oxidising nature of \[\ce{H2O2}\]?
Which of the following equation depicts reducing nature of \[\ce{H2O2}\]?
Explain why \[\ce{HCl}\] is a gas and \[\ce{HF}\] is a liquid.
Why does water show high boiling point as compared to hydrogen sulphide? Give reasons for your answer.
How will you account for 104.5° bond angle in water?
Write two reactions to explain amphoteric nature of water.
The boiling point of water increases with ______ in pressure.
Freezing of water will cause an ______ is the volume.
One gram of water requires ______ of heat to raise its temperature by l°C.
Water is circulated around the car engine using the ______ pump and the heat is absorbed.
What is the taste of distilled water & boiled water?
The density of gold is 19 g/cm3. If 1.9 × 10−4 g of gold is dispersed in one litre of water to give a sol having spherical gold particles of radius 10 nm, the number of gold particles per mm3 of the sol will be ______ × 106.
