What is the approximate amount of the annual net primary productivity of the whole biosphere?

Category: QuestionsWhat is the approximate amount of the annual net primary productivity of the whole biosphere?
Editor">Editor Staff asked 3 months ago

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 matter
 
The question was posed to me at a job interview.
 
This interesting question is from Ecosystem topic in division Ecosystem of Biology – Class 12

1 Answers
Editor">Editor Staff answered 3 months ago

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.