NEET Botany Ecosystem Components MCQ Question
If the gross primary productivity (GPP) of an ecosystem is 2000 kcal m^-2 yr^-1 and the respiration losses (R) are 800 kcal m^-2 yr^-1, what is the net primary productivity (NPP)?
1200 kcal m^-2 yr^-1
2800 kcal m^-2 yr^-1
2000 kcal m^-2 yr^-1
800 kcal m^-2 yr^-1
Correct Answer
Detailed Explanation
Net primary productivity (NPP) is calculated by subtracting respiration losses (R) from gross primary productivity (GPP). Therefore, NPP = GPP - R = 2000 kcal m^-2 yr^-1 - 800 kcal m^-2 yr^-1 = 1200 kcal m^-2 yr^-1.
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