Question

Which of the following correctly represents the energy flow in an ecosystem based on productivity concepts?

Options

• GPP → NPP → Secondary Productivity

• NPP → GPP → Secondary Productivity

• Secondary Productivity → NPP → GPP

• Respiration → GPP → NPP → Secondary Productivity

Answer 1

The correct energy flow sequence is GPP → NPP → Secondary Productivity. Producers first generate GPP through photosynthesis, then subtract their respiratory losses (R) to yield NPP. This NPP is then available to consumers, which generate secondary productivity through assimilation of the available organic matter.