The Chipko movement was started for the conservation of which of the following?

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

Identify the odd one out regarding the process of bio-magnification.

What is the effect of $Pb$ (lead) on catalysts?

Which one of the following is not a bioindicator of water pollution?

Match the following columns.

Column-$I$	Column-$II$
$(p)$ $CFC$	$(v)$ Troposphere
$(q)$ Bad ozone	$(w)$ Plastic
$(r)$ Good ozone	$(x)$ Ozone depletion is occurring widely
$(s)$ Non-biodegradable waste	$(y)$ Stratosphere
	$(z)$ Paper,leaf