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

Assertion: Eutrophication shows an increase in productivity in water.
Reason: With increasing eutrophication,the diversity of the phytoplankton increases.

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Electrostatic Precipitator	$(1)$ Platinum,Palladium,Rhodium
$(b)$ Scrubber	$(2)$ Collecting plates
$(c)$ Catalytic Converters	$(3)$ Recycled modified plastic
$(d)$ Polyblend	$(4)$ Water or lime spray

Select the appropriate option regarding the natural aging of a lake.

Which of the following statements is correct?

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