$A$: Polyblend is a fine powder of recycled modified plastic.
$R$: The blend of polyblend and bitumen helps to increase road life by a factor of three.

In a pond near a village,a large number of fish suddenly die. Which of the following could be the reason for this?
$(a)$ Large amounts of urea and phosphate are used as fertilizers in nearby fields.
$(b)$ $DDT$ was sprayed in the entire area.
$(c)$ The pond water has become green and dirty.
$(d)$ The population of phytoplankton in the pond has decreased,reducing the photosynthetic capacity.
Which two of the above reasons are responsible?

Which of the following is not properly matched?

At the beginning of the twentieth century,forests covered about ........... of the land area of India. (in $\%$)

The Haryana Kisan Kalyan Club was created by $..........$.

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