Soil conservation can be best achieved by having

Identify the odd one out.

Read the following statements carefully and select the correct ones.
$I.$ $UV$ rays are essential for the production as well as degradation of ozone gas.
$II.$ Ozone present in the ionosphere acts as a shield absorbing $UV$ radiation coming from the sun.
$III.$ One-fourth of the incoming solar radiation is reflected by the atmospheric gases and clouds,and only half of the incoming solar radiation falls on the earth's surface,heating it. Of this,only a small portion is reflected back.

Blends of polyblend and bitumen,when used,help to increase road life by a factor of three. What is the reason?

Polyblend is mixed with ...$A$... to lay roads in ...$B$.... Complete the given statement by choosing the appropriate option for $A$ and $B$.

Which one of the following is not related to $5\; F's$ of the Chipko movement?