question_answer 16)

      Productivity is the rate of production of biomass expressed in terms of (i) (ii) (iii)                (iv) (a) (ii)                                    (b)(iii)                                    (c) (ii) and (iv)                    (d) (i) and (iii)

Answer:

                    (c) Productivity is the rate of production of biomass or organic matter by any trophic level per unit area over a time period. It is expressed/measured in term of weight (e.g., gm//) or energy (e.g., kcal//).