What is the approximate amount of the annual net primary productivity of the whole biosphere?(a) 80 million tons of organic matter(b) 170 billion tons of organic matter(c) 10 billion tons of organic matter(d) 2 million tons of organic matterThe question was posed to me at a job interview.This interesting question is from Ecosystem topic in division Ecosystem of Biology – Class 12

What is the approximate amount of the annual net primary productivity

1.	What is the approximate amount of the annual net primary productivity of the whole biosphere?(a) 80 million tons of organic matter(b) 170 billion tons of organic matter(c) 10 billion tons of organic matter(d) 2 million tons of organic matterThe question was posed to me at a job interview.This interesting question is from Ecosystem topic in division Ecosystem of Biology – Class 12
Answer» The correct answer is (B) 170 billion tons of organic matter The best I can explain: The net PRIMARY productivity is the energy left after the RESPIRATION i.e. the gross primary productivity SUBTRACTED by respiration losses. It is approximately 170 billion tons of organic matter of the whole biosphere.

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