If we uncover half of the forest, covering of the earth, what crisis will be produced at most and at first?<br> &l…

Products of organic farming are preferred because they are<br> </h2></div>

Multiple Choice Questions<br> BOD in river water<br> </h2></div>

Why depletion of ozone layer a cause of concern?</h2></div>

Who is the greatest enemy of nature and organism?</h2></div>

How does deforestation affect the biodiversity of the forest ecosystem </h2></div>

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

What do BOD and COD stand for?