There is a great diversity among living organisms found on the planet earth.
They differ in their structure, habit, habitat, mode of nutrition, and physiology.
The Biodiversity of the earth is enormous. Current estimates suggest that the earth
may have anywhere from 10 to over 40 million species of organisms, but only
about 1.7 million have actually been described including over 7,50,000 insects, about
2,50,000 flowering plants and 47,000 vertebrate animals. We call such a diversity
among living organisms as Biodiversity
The term biosphere’ had been coined to highlight the interde-
pendence of living and non-living world. It represents a stable environment of
various physical and biological factors which have been operating since the
past. The organic continuity of the system rests on a delicate network of inter-
dependent relationships. The air, the water, the animals, the plants, the mi-
crobes and human beings are all interlinked in a life sustaining system, called
we are all inter dependent for survival. Even if one organism at any level of the food chain goes missing, then the entire ecosystem will be affected. Biodiversity adds life and colour to the earth. But more importantly it is necessary for the survival of all living beings.