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Annual net primary productivity of the whole biosphere is about:

A17 billion tons
B170 billion tons
C55 billion tons
D500 billion tons
Answer & Solution
Correct answer: B. 170 billion tons
1. It is measured as dry weight of organic matter. 2. The figure is about 170 billion tons. 3. Oceans contribute only 55 billion tons. _Source: syllabus Biology, Chapter 14, Ecosystem._
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