Which one of the following ecosystems is more productive in terms of carbon dioxide fixation?

What is primary productivity? Give a brief description of the factors that affect primary productivity.

Net Primary Productivity $(NPP) = ..............$

Define the following terms:
$(i)$ Productivity
$(ii)$ Decomposition

The biomass produced by plants in the oceans accounts for approximately how much of the total global primary productivity (in $\%$)?

State whether the following statements are True or False:
$I.$ The total organic matter synthesized by the producers in the process of photosynthesis per unit time and area is known as gross primary productivity.
$II.$ Net primary productivity is the weight of the organic matter stored by the producers in a unit area/volume per unit time.