Q73.
Which one of the following is the correct sequence of ecosystems in the order of decreasing productivity?
Answer
C
Explanation
Net primary productivity values: Mangroves ~2500 g/m²/yr, Grassland ~500 g/m²/yr, Lakes ~500 g/m²/yr (but slightly less than grassland), Open Ocean ~125 g/m²/yr. So the decreasing order is: Mangroves > Grasslands > Lakes > Oceans.