alleryThe annual net primary productivity of the whole biosphere is approximately:
A570 billion tons
B970 billion tons
C170 billion tons
D270 billion tons
Answer & Solution
Correct answer: C. 170 billion tons
1. Net primary productivity is what remains after plant respiration.
2. Measured over the whole biosphere it is a very large dry weight.
3. The annual net primary productivity of the biosphere is approximately 170 billion tons.
4. That figure is dry weight of organic matter.
_Source: syllabus Biology, Ch 12 'Ecosystem'_
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