Ozone is found in the atmosphere and helps to protect us from harmful radiation. Ozone is</h2></div>

<span>Chemically, DDT is a</span></h2></div>

Bio-agents such as culture of blue green algae are used in preparation of</h2></div>

Which chemical is a 'ozone' depleting solvent?<span><br> </span></h2></div>

Name five common water pollutants.</h2></div>

The natural vegetation in a particular area is termed as <br> </h2></div>

What is B.O.D.?</h2></div>

The given figures represent two devices A and B used to control air pollution. Identify them and select the correct answ…