Productivity is the rate of production of biomass expressed in terms of :
i. $(\mathrm{kcal}<mspace\; width="1em"></mspace>{\mathrm{m}}^{-3})<mspace\; width="1em"></mspace>{\mathrm{yr}}^{-1}$
ii. $\mathrm{g}<mspace\; width="1em"></mspace>{\mathrm{m}}^{-2}<mspace\; width="1em"></mspace>{\mathrm{yr}}^{-1}$
iii. $\mathrm{g}<mspace\; width="1em"></mspace>{\mathrm{m}}^{-1}<mspace\; width="1em"></mspace>{\mathrm{yr}}^{-1}$
iv. $(\mathrm{kcal}<mspace\; width="1em"></mspace>{\mathrm{m}}^{-2})<mspace\; width="1em"></mspace>{\mathrm{yr}}^{-1}$

In an ecosystem, the rate of production of organic matter during photosynthesis is called as its:

Net primary productivity is the gross primary productivity minus:

Secondary productivity in an ecosystem can be defined as:

The annual net primary productivity of whole biosphere is approximately:

What percentage of photosynthetic active radiation is captured by plants?

On the land, almost all primary production is performed by:

Suppose in an area, the energy present in total incident sunlight falling on primary producers is 10,00,000 J and about 10,000 J is converted by them into biomass. What percent of PAR have the primary producers been able to convert?