The Bhopal gas tragedy occurred in $1984$ because methyl isocyanate reacted with .......

Who is concerned with organic farming?

Which of the following human activities is responsible for desertification?

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

Arrange the following options in ascending order of their $BOD$ value.
$I.$ Sample of highly polluted pond water.
$II.$ Sample from unpolluted pond water.
$III.$ Distilled water.

Match the following columns:

Column-$I$	Column-$II$
$(p)$ Catalytic converter	$(i)$ Foam
$(q)$ Marsh land	$(ii)$ Powder of plastic
$(r)$ Polyblend	$(iii)$ Air pollution
$(s)$ Elnino effect	$(iv)$ Deforestation
$(t)$ Chipko movement	$(v)$ Green House effect