The ozone layer in earth's atmosphere is crucial for human survival because it<br> </h2></div>

Statement 1 : BOD represents the amount of dissolved oxygen that would be consumed if all the organic matter in one litr…

What is organic farming?</h2></div>

What is the main source of water pollution in India?</h2></div>

How has DDT caused decline in bird population?</h2></div>

<span>Forest reserves can be protected through all measures except</span><br> </h2></div>

Deforestation generally decreases </h2></div>

Multiple Choice Questions<br> Biochemical oxygen demand may not be good index for water bodies receiving effluents…