Total energy fixed by an ecosystem is called

The rate at which light energy is converted into chemical energy of organic molecules is the ecosystem's

Why is the rate of assimilation of energy at the herbivore level called secondary productivity?

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.

Secondary productivity is defined as ...

The annual net primary productivity of the whole biosphere is approximately $...........$ (dry weight) of organic matter.