The major pollutants to deplete ozone are</h2></div>

BOD (biological oxygen demand) is</h2></div>

It is a common practice to plant trees and shrubs near the boundary walls of buildings<span>. What purpose do they…

By the end of the twentieth century what percent of the land of India was covered by forests?

A river/ lake with an inflow of domestic sewage rich in organic waste may result in</h2></div>

Water pollution can be caused due to:</h2></div>

Which of the following are the correct approaches to reduce global warming ?<br> (i)   Use of fo…

Organic farming does not include ________.</h2></div>