A temperate marsh records Gross Primary Production of $8500 kJ m^{- 2} d^{- 1}$ and ecosystem respiration of $2500 kJ m^{- 2} d^{- 1}$ . Calculate the Net Primary Production (NPP) per square metre per day.

easy 1 mark Class 12 · Biology · Ecosystem

Answer

6000 kJ m^{- 2} d^{- 1}

The correct answer is $6000 kJ m^{- 2} d^{- 1}$ — $N P P = GP P - Respiration = 8500 - 2500 = 6000$

Step-by-step solution

Common mistake: Adding respiration to GPP instead of subtracting

Concept tested: Primary production, Net Primary Production