In Maharashtra,a $24$ hours toll-free helpline number $1926$ has been set up to provide information regarding:

Which processes were included in the integrated organic farming by Ramesh Chandra Dagar,a farmer from Sonipat,Haryana?
$I-$ Bee-keeping
$II-$ Dairy management
$III-$ Water harvesting
$IV-$ Composting
$V-$ Chemical fertilizers
$VI-$ Chemical pesticides

At the beginning of the twentieth century,forests covered about ........... percent of the land of India. By the end of the century,it shrunk to ............. percent.

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Chipko Movement	$(1) \ 1987$
$(b)$ National Forest Policy of India	$(2) \ 1980$
$(c)$ Joint Forest Management	$(3) \ 1988$
$(d)$ Montreal Protocol	$(4) \ 1974$

$A$ lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this.
$A.$ Lots of urea and phosphate fertilizer were used in the crops in the vicinity.
$B.$ The area was sprayed with $DDT$ by an aircraft.
$C.$ The lake water turned green and stinky.
$D.$ Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.
Which two of the above were the main causes of fish mortality in the lake?

According to a $1990$ report,Delhi ranked $........$ among the $41$ most polluted cities in the world.