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The annual net primary productivity of the biosphere is about:

A550 billion tons
B770 billion tons
C170 billion tons
D270 billion tons
Answer & Solution
Correct answer: C. 170 billion tons
1. The figure is given as dry weight of organic matter. 2. Oceans contribute only 55 billion tons of it. 3. The total is approximately 170 billion tons. 4. So the answer is 170 billion tons. _Source: syllabus Biology, Ch 12 'Ecosystem'_
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