The main factor responsible for the depletion of ozone layer is addition of _____in the atmosphere.</h2></div&g…

'Human activities' are playing main role in causing;<span><br> </span></h2></div>

Give two ways in which we can all helps to reduce global warming. Write a catchy slogan to create awareness about it.&lt…

When domestic sewage mixes with river water </h2></div>

BOD is ___________ in polluted water and ________in potable water.</h2></div>

The atmospheric greenhouse effect is produced mainly by the:<span><br> </span></h2></div>

What would happen if all the decomposers were eliminated from the earth? Explain.</h2></div>

Which of the following is not a green-house gas?<br> </h2></div>