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The state of West Bengal has huge geographical diversities. With respect to the geographical classification the entire bulk area of the state, thus can be divided into many physiographic regions. Each physiographic region has its own distinguished features. The climate, the weather pattern, the soil type and other abiotic factors associated are quiet different in these regions. Therefore as the non living parameters are variable, the change or differences with respect to biotic factors,doi:10.5281/zenodo.2619388 fatcat:xw63ltrdzjhptgpoafe6mtg5ji