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NEET BIOLOGY UNIT25  ORGANISMS AND POPULATIONS At various level of biological organisation macromolecules, cells,tissues, organs, individual organisms, population,communities and scosystems and biomes, complexity by investigating processes can be understood. Ecology deals with the study of interactions and interrelationships between organisms and thir environment.It is concerned with the four level of biological organisations-organisms, populations, communities and biomes. The essence of ecological understanding is to know how organisms interact with other organisms and physical environment as a group and hance behave like organised wholes i.e., population, community, ecosystem or even as the whole biosphere. This topic emphasize more on organismic and population level. BIOLOGY FOR NEET & AIIMS Introduction  The term ecology was coined and described by E.Haeckel. The term ecology was first authentically used by Reiter.  Father of ecology – Reiter  The term ...