Secondary productivity is the rate of formation of new organic matter by:

In which form can the productivity of ecosystems be compared?

The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is called:

Productivity contributed by oceans is . . . . . . but area covered is comparatively . . . . . . .

Which of the following represents the amount of energy available to a grasshopper in a food chain?

Given below are two statements:
Statement $I$: The primary source of energy in an ecosystem is solar energy.
Statement $II$: The rate of production of organic matter during photosynthesis in an ecosystem is called net primary productivity $\text{(NPP)}$.
In the light of the above statements,choose the most appropriate answer from the options given below: