Which of the following statements is incorrect regarding $DDT$?

Consider the following reasons for the massive fish mortality observed in a lake near a village within a few days:
$(1)$ Excessive use of urea and phosphate fertilizers in nearby crops.
$(2)$ Spraying of $DDT$ using aircraft.
$(3)$ The lake water turned green and foul-smelling.
$(4)$ Initial decrease in phytoplankton in the lake leads to a maximum decrease in photosynthesis.
Which of the above reasons are responsible for the massive fish mortality?

What is the main idea behind the "Joint Forest Management Concept" introduced by the Government of India?

Match the Column-$I$ with Column-$II$:

Column-$I$	Column-$II$
$(a)$. Pyrolysis	$(i)$. Methaemoglobinemia
$(b)$. Carbon monoxide	$(ii)$. Chronic exposure to arsenic
$(c)$. Blue baby syndrome	$(iii)$. Asphyxia and giddiness
$(d)$. Black foot disease	$(iv)$. Disposal of hospital waste

Identify the correct statement regarding Eutrophication.

Soil conservation is a practice in which soil: