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

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(B) Productivity is defined as the rate of biomass production per unit area over a time period. It is expressed in terms of weight $(gm^{-2}yr^{-1})$ or energy $(kcal,m^{-2}yr^{-1})$. Since the question refers to the general measurement of productivity in these units, the correct answer is Productivity.