Systematics

Systematics Taxonomy (G. taxis - arrangement; nomos -law) is the science of arrangement of living organisms along with classification, description, identification, and naming Ecosystem is a community of biotic and a biotic factors and their interrelationships ( A.G. Tansley, ). The presence of a large number of species in a particular ecosystem is called ‘biological diversity’ or in short ‘­biodiversity’. The term biodiversity was first ­introduced by Walter Rosen ( ), and defined by E.D. Wilson. Characterstic features of living organisms Living organisms show a variety of unique characters different from non- living matter. The key characters of living organisms are, cellular organization, nutrition, respiration, metabolism, growth, response to stimuli, movement, reproduction, excretion, adaptation and homeostasis. Numerous scientists and taxonomists have made tremendous contribution and documentation in the observation and study of even minute characters in living organisms. Their keen observations have led to the classification of living organisms and the study of their interrelationships.