Define Ozone layer.</h2></div>

Some statements are given below each with one or two blanks. Select the option that correctly fills up the blanks.<di…

Huge quantity of sewage is dumped in a river. The BOD will.</h2></div>

BOD of wastewater is amount of</h2></div>

Hatchlings grown in nursery ponds form :</h2></div>

Which of the following is an example of freon ?</h2></div>

The term 'Phytoremediation' refers to the _________________.</h2></div>

A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called as<br> &…