An ecosystem with high species diversity is far more stable than an ecosystem with low species diversity. In terms of productivity and more resistance towards disturbances like alien species invasions and floods, the ecosystem becomes more stable. The ecological balance would not get hampered if an ecosystem is rich in biodiversity. In an ecosystem, all the trophic levels are connected via food chains. If any organism or all organisms of any one trophic level is killed, then the entire food chain will be disturbed. For example, if all plants are killed in a food chain, then all deer will die due to the lack of food. Soon the tigers will also die if the death of deer occurs. Thus, Other food alternatives would be there at each trophic level which might not allow an organism to die because of the absence of their food resource if an ecosystem is rich in species. Hence, a crucial role is played by biodiversity in maintaining the health and ecological balance of an ecosystem.