What is primary productivity ? Give a brief description of the factors that affect primary productivity .

Explanation

Primary productivity refers to the rate of production of biomss or organic matter per unit area over a time period by the producers in an ecosystem .
Varius factors which affect primary productivity include light , temperature , water , nutrients ect . In deserts , sunlight is abundant but water is scarce or nutrients are lacking . Therefore , in such areas water is scarce or nutrients are lacking . Therefore , in such areas water and nutrient supply become the limiting factor . Productivity increases from polar regions towards the tropics because of the increasing sunlight and temperature .