BOD of two samples of water A and B were 120 mg/l and 400 mg/l respectively. Which sample is more polluted.</h2>&l…

Which of the following can be created using crop waste?

What is organic farming?</h2></div>

Which materials are hard to remove from the polluted water?

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

When harmful substances such as sewage, toxic chemicals get mixed with water, then:</h2></div>

Who is the greatest enemy of nature and organism?</h2></div>

Example for a physical pollutant<span><br> </span></h2></div>