When do the planktonic algae utilize oxygen?

List any four factors which determine the amount of dissolved oxygen in water. Explain in brief the harmful effects of n…

Which one of the following is a greenhouse gas?</h2></div>

Measurement of rate of oxygen utilisation by a unit volume of water over a period of time is to measure</h2></d…

Name the agents responsible for transportation of soil.</h2></div>

The pesticides used in organic farming are<br> </h2></div>

Which component of an electrostatic precipitator can remove gases like sulphur dioxide through a spray of water or lime?

Match the items given in Column I with those in Column II and select the correct options given below:<br> <tabl…