In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is: 
what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?
Text Solution
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(d, a)
The NPP of the first trophic level is the GPP of the second trophic level and the NPP of the 2nd trophic level is GPP is 3rd trophic level.
According to the 
law 90 per cent is the respiratory loss (R) at each trophic level.
At the first trophic level NPP is 
which is GPP of second trophic level.
At second trophic level NPP is 
of GPP 
Since the GPP of the 3rd trophic level is the same as the NPP of the second trophic level, it is equal to 
.
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