Which of the following habitats is most unsuitable for primary productivity?

Primary productivity depends on.........

Which of the following is the unit of productivity of an ecosystem?

Which one of the following ecosystems has the highest annual net primary 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.

Explain productivity and its types.