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

Oil refineries, paper factories, textile and sugar mills, chemical factories are responsible for water pollution. These …

Name two natural biopesticides.</h2></div>

Which of the following gases is regarded as an atmospheric pollutant?</h2></div>

BOD is related with </h2></div>

Which of the following waste can be put into deep pits in the ground and be left for the natural breakdown?

Which of the following chemicals is responsible for the depletion of ozone layer in the atmosphere?</h2></div&g…

Size of particulate matter ranges from ___.<span><br> </span></h2></div>