$...............$ is any undesirable change in the physical,chemical,or biological characteristics of air,land,water,or soil.

$A$ scrubber in the exhaust of a chemical industrial plant removes

Define and explain the concept of Biological Magnification.

According to the Euro $III$ norms,what was the controlled limit for sulfur content in petrol?

The following water samples are given with their $BOD$ values. Which sample has the lowest level of pollution?
Sample $w - 6 \ mg/L$,Sample $x - 6.5 \ mg/L$
Sample $y - 7 \ mg/L$,Sample $z - 10.3 \ mg/L$

Eutrophication is the result of