Ecosystem - NCERT
biomass or organic matter produced per unit area over a time period by plants during photosynthesis. It is expressed in terms of weight ( gm–2) or energy (kcal m –2). The rate of biomass production is called productivity . It is expressed in terms of gm–2 yr–1 or (kcal m–2) yr–1 to compare the productivity of different ecosystems.
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