Which of the following is a pollution-related disorder?

Which component of a living cell is affected by the pollutant $SO_2$?

Fly-ash is a/an :

The excessive discharge of fertilizers into water bodies results in

Assertion : Inhabitants close to very busy airports are likely to experience health hazards.
Reason : Sound level of jet aeroplanes usually exceeds $160 \, dB$.

$A$ river with an inflow of domestic sewage rich in organic waste may result in