Which of the Following Ecosystems Would Likely Have the Largest

Multiple Choice

Which of the following ecosystems would likely have the largest net primary productivity per hectare and why?

A) open ocean, because of the total biomass of photosynthetic autotrophs
B) grassland, because of rapid growth, the small standing crop biomass that results from consumption by herbivores, and rapid decomposition
C) tundra, because of the incredibly rapid period of growth during the summer season
D) deep ocean, due to the high activity of chemoautotrophs at deep sea vents