For which major rivers in India has the Ministry of Environment and Forests initiated action plans?

$1981 =$ Air Act in India :: $1980 =$ ......

Select the appropriate option regarding forest conservation.

Which of the following is not dangerous for life and the atmosphere?

Estuaries occur in which of the following Indian states?

What is the ascending order of $BOD$ for the following: Sewage $(S)$,Paper mill effluent $(PE)$,Distillery effluent $(DE)$,and Sugar factory effluent $(SE)$?