In relation to gross primary productivity and Net primary productivity of an ecosystem which one of the following statements is correct?
Option: 1 Gross primary productivity is always less than net primary productivity 
Option: 2 Gross primary productivity is always more than net primary productivity 
Option: 3 Gross primary productivity and net primary productivity  are one and the same
Option: 4 There is no relationship between Gross primary productivity and net primary productivity.  

Answers (1)

Gross primary productivity is always more than net primary productivity. It is because GPP is the total solar energy trapped in the food material by photosynthesis. On the other hand, Gross primary productivity minus respiration losses (R), is the net primary productivity (NPP). Hence, the correct option is (b).

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