"BOD is commonly calculated as an index of water pollution."<br> (a) Do you agree with this statement ? …

Sewage water is purified for recycling by the action of:</h2></div>

<span>Chemically, DDT is a</span></h2></div>

To dispose of which waste are the deep pits dug in desert areas or in the sea bottom?

There is a hole in the ozone layer. What do you understand by this?</h2></div>

Identify the integrated farming of crops and livestock.</h2></div>

What are the three main causes of water pollution?<br> <br> </h2></div>

<span>"Determination of Biological oxygen Demand (BOD) can help in suggesting the quality of a water body&quo…