Primary Productivity

Q. Productivity is the rate of production of biomass expressed in terms of:

1. $\left(kcal{m}^{–3}\right)y{r}^{–1}$
2. $g{m}^{–2}y{r}^{–1}$
3. $g^{–1}y{r}^{–1}$
4. $kcal{m}^{–2}y{r}^{–1}$