Biological diversity or biodiversity refers to the variety and variability of life on earth. Biodiversity is expressed at three levels on earth; genetic diversity, species diversity and ecosystem diversity. Its direct and indirect services are crucial for the sustenance of life on this planet.

Biodiversity ensure food, fuel, shelter, medicines and other resources which are vital for our survival. Most of the crops pests are controlled by a variety of other organisms, including insects, birds and fungi; which are certainly superior natural pesticides than their chemical equivalents. The pesticides which are extensively used are really harmful to human beings and the environment.