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ecology life science fixation of nitrogen in plant roots nitrogen fixing plants atmospheric nitrogen bnf plant science nitrogen botant plant ecology nitrogen fixation biological nitrogen fixation population growth pattern exponential and logistic growth curve j-shaped and s-shaped growth curve population growth population ecology population growth curves biological science botany biology function of autoclave sterilization uses of autoclase mechanism of autoclave working procedure of autoclave principles of autoclave definition of autoclave what is autoclave? autoclave viability growth factors affecting germination viviparous germination hypogeal germination epigeal germination types of seed germination dormancy abiotic and biotic factors of seed germination different factors of seed germination germination of seeds seed germination leguminose plants