Productivity is the rate of production of biomass expressed in terms of
(i) `("kcal"m^(-3))yr^(-1)`
(ii) `g^(-2)yr^(-1)`
(iii) `g^(-1)yr^(-1)` (iv) `("kcal"m^(-2))yr^(-1)`

Options

A. ii
B. iii
C. ii and iv
D. I and iii

Answer

C

Explanation

The rate of synthesis of energy containing organic matter or biomass by any trophic level per unit area in unit time is described as its productivity. It is measured as weight (e.g., `g//m^(2)//yr`) or energy (e.g, `Kcal//m^(2)yr`). Hence, only unit (iv) is correct.