Petroleum is a ......... source.

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Haryana	$(1)$ Ozone hole
$(b)$ Chernobyl	$(2)$ Integrated organic farming
$(c)$ Garhwal	$(3)$ Radioactive waste leakage
$(d)$ Antarctica region	$(4)$ Chipko movement

Which of the following statement$(s)$ is/are not correct regarding biomagnification?
$I.$ Heavy metals and persistent pesticides pass into the food chain and increase in amount per unit weight of organisms with the rise in trophic level due to their accumulation in fat.
$II.$ Accumulation of zinc can cause thinning of eggshells in birds.
$III.$ $DDT$ accumulation is a major cause of the killing of fish-eating birds.
$IV.$ Biomagnification occurs only in marine food chains.

$A$: Ecological sanitation is a sustainable system for handling human excreta.
$R$: It is a practical and hygienic method of using dry composting toilets.

$FOAM$ stands for $........$

Among the $41$ most polluted cities of the world,Delhi ranked