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In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?

1. Gross primary productivity is always more than net primary productivity
2. Gross primary productivity and Net primary productivity are one and same
3. There is no relationship between Gross primary productivity and Net primary productivity
4. Gross primary productivity is always less than net primary productivity

Correct answer: Gross primary productivity is always more than net primary productivity

Solution

Gross primary productivity (GPP) is the total energy captured by producers, while net primary productivity (NPP) is what remains after producers use some energy for respiration. Since NPP = GPP − respiration, GPP is always greater than NPP.

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