Solid waste serve as useful resource for providing energy for our industries.</h2></div>

What are the effects of ozone depletion ?</h2></div>

Use of pesticides decreases water pollution.</h2></div>

Noxious fume pollutes air due to burning of:<span><br> </span></h2></div>

Biochemical Oxygen Demand (BOD) in a river water</h2></div>

Which of the following statements is correct?   </h2></div>

Environment is warmed up by</h2></div>

'Biological Oxygen Demand' (BOD) is a measure of </h2></div>