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Which is correct about GPP and NPP in a ecosystem?
A
NPP = GPP - Plant respiration
B
NPP = GPP + Plant respiration
C
NPP = GPP - Animal respiration
D
NPP = GPP + Animal respiration

montblack1 jain , 5 Years ago
Grade 7
anser 1 Answers
ankit singh

n a food chain, energy stored at the producer level is called as primary productivity (PP). 

Energy stored at the consumer level is called as secondary productivity. It is the rate of energy storage at the consumer level. 
Consumer-level includes herbivores, carnivores and decomposers. Gross primary productivity (GPP) is the rate of photosynthesis. 
Net primary productivity (NPP) is the rate of storage of organic matter except which is utilized for the respiration by plants. 
Hence, we can say that NPP = GPP - plant respiration. It is the total biomass available for consumers.
Thus, the correct answer is 'NPP = GPP - Plant respiration.'
Last Activity: 5 Years ago
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