C.O.D. stands for</h2></div>

Bharat norms are applicable to </h2></div>

BOD is related with </h2></div>

High BOD values for a river means that river water</h2></div>

If the smog density of an area increases, it indicates</h2></div>

Which compounds are responsible for the depletion of ozone layer?</h2></div>

The pollutant responsible for ozone depletion is _______.</h2></div>

All of the following are associated with organic farming except</h2></div>