Multiple Choice Questions<br> BOD in river water<br> </h2></div>

Rahul wanted to gift wooden toys as return gift to his friends on his birthday. But his father suggested him to gift sap…

Ozone in stratosphere extends</h2></div>

What is the meaning of environmental protection?</h2></div>

Decrease in species diversity in tropical countries is mainly due to<br> </h2></div>

Drained sewage has B.O.D.</h2></div>

The gas that usually causes explosion in coal mines is</h2></div>

BOD is ___________ in polluted water and ________in potable water.</h2></div>