Depletion of the Ozone layer in the stratosphere is caused by.</h2></div>

<span>When air is contaminated by ______________ substances which have a ________________ effect on both the _____…

Which one of the following diseases is caused due to ozone depletion on human?</h2></div>

Find the odd one out:<br> </h2></div>

Which type of electron is present in free radical?</h2></div>

The major source of BOD in the river Ganga is </h2></div>

<b>Define electronic waste and list at least six items which come under this category.</b><br> </h2…

'Biological Oxygen Demand' (BOD) is a measure of </h2></div>