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The annual net primary productivity in terms of dry weight of organic matter of the whole biosphere is approximately
A. 175 billion tons
B. 170 million tons
C. 170 billion tons
D. 180 billion tons

Answer :

The annual net primary productivity in terms of dry weight of the whole biosphere is approximately 170 billion tons, accounting for both marine and terrestrial contributions. Therefore correct option is C

The annual net primary productivity of the whole biosphere in terms of dry weight of organic matter is a critical measure of the planet's capacity to support life. It counts the organic matter available as food after considering the energy used in cellular respiration. Global estimates combine both terrestrial and marine environments, where terrestrial productivity is generally higher.

Overall, marine productivity contributes 35-50 billion metric tons per year, and terrestrial ecosystems contribute more, with an average of 50-70 billion tons annually. Considering these figures, the combined total annual net primary productivity is approximately 170 billion tons (combining the higher end of marine with the lower end of terrestrial estimates).

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