Given below are two statements:
Statement I: The primary source of energy in an ecosystem is solar

Question

Given below are two statements: 
Statement I: The primary source of energy in an ecosystem is solar energy. 
Statement II: The rate of production of organic matter during photosynthesis in an ecosystem is called net primary productivity (NPP). 
In the light of the above statements, choose the most appropriate answer from the options given below:

Professor PC Thomas Classes · Answer

(a) : The rate of production of organic matter during photosynthesis in an ecosystem is called gross primary productivity (GPP). A considerable amount of GPP is utilised by autotrophs in respiration. Gross primary productivity minus respiration losses (R) is the net primary productivity (NPP). 
$G P P-R=N P P$