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...Topic ecosystem lecture no b sc part zoology hons paper i group chapter date th march author dr nirmal kumari objectives the study of major ecosystems freshwater marine forest and desert concept component their function energy flows food chain web trophic structures ecological pyramid introduction law limiting factor structural functional system communities environment is called an thus basic unit ecology term was proposed by a g tansley in it may be defined as formed community or considered most important aspect there are many other parallel terms synonyms for which have been various ecologist e biocoenonsis karl mobius microcosm s forbes holocoen friederichs biosystem thienemann pond whole represents complete self maintaining regulating can defind body shallow standing water characterized relatively quiet abundant vegetation with thousand micro organism large plant animal all four well represented these abiotic substances non living components eco include inorganic organic compound s...