(A) Productivity is defined as the rate of biomass production per unit area over a time period.It is expressed in terms of mass $(gm^{-2} yr^{-1})$ or

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(A) Productivity is defined as the rate of biomass production per unit area over a time period.It is expressed in terms of mass $(gm^{-2} yr^{-1})$ or energy $(Kcal m^{-2} yr^{-1})$.Among the given options,$gm^{-2} yr^{-1}$ represents the unit of primary productivity in terms of biomass.