Peak concentration of ozone occurs in the atmosphere above a height of</h2></div>

Main cause of extinction of species from tropical areas is<span><br> </span></h2></div>

Use of pesticides decreases water pollution.</h2></div>

Mention any three human activities which are responsible for depletion of the ozone layer.</h2></div>

Select from the following, the substances, which have posed a threat to the environment:<br> Aerosols, consumers, …

E-waste causes _________ pollution.<br> </h2></div>

"BOD is commonly calculated as an index of water pollution."<br> (a) Do you agree with this statement ? …

BOD refers to</h2></div>