How are productivity, gross productivity, net primary productivity and secondary productivity interrelated ?

What is net primary productivity ?

Write the relationship between productivity, gross primary productivity, net primary productivity, net primary productivity and secondary productivity.

The secondary productivity means

Secondary productivity is defined as

Gross primary productivity is the

Gross primary productivity is-

For net primary productivity energy captured is

The rate of biomass production is called productivity . They are of two types : Gross primary productivity and Net primary productivity . How these two productivities are related ?

The net primary productivity of an ecosystem is :