The World Summit on Sustainable Development $(2002)$ was held in which of the following countries?

The warm Peruvian current that appears every $5$ to $8$ years off the coast of South America in the eastern Pacific is known as:

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Biomagnification	$(1)$ Nitrates and Phosphates
$(b)$ Eutrophication	$(2)$ Chlorine
$(c)$ Global warming	$(3)$ $DDT$
$(d)$ Ozone depletion	$(4)$ Greenhouse gases

Given below are two statements.
Statement $I$ - Algal blooms impart a distinct color to the water bodies.
Statement $II$ - Some bloom-forming algae are extremely toxic to fishes but not to human beings and other animals.
In the light of the above statements,select the correct option:

Consider the following statements about Ramesh Chandra Dagar's work in the field of organic farming:
$I.$ Ramesh Chandra Dagar's work includes bee-keeping,dairy management,water harvesting,composting,and agriculture in a chain of processes.
$II.$ In this process,there is no need to use chemical fertilisers for crops as cattle excreta is used as manure.
$III.$ Crop waste is used for making compost,which is used as natural fertilizer.
$IV.$ Compost generates natural gas,which is used for the energy needs of the farm.
Which of the statements given above are correct?

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