Which of the following is expected to have the highest value $\left(\mathrm{gm} / \mathrm{m}^2 / \mathrm{yr}\right)$ in a grassland ecosystem?

Gross primary productivity is the amount of carbon fixed during photosynthesis by all producers in the ecosystem. net primary production (NPP) is the rate at which material is accumulated in excess of respiration $(\mathrm{NPP}=\mathrm{GPP}-$ respiration). Related Theory The amount of new biomass (weight) that is produced by meat-eating animals (carnivores) in a given period of time is called tertiary production.