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Question

In terms of the dry weight of organic matter, which of the following is related to the annual net primary productivity of the whole biosphere?

A
12 billion tonnes
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B
Environmental factor
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C
Herbivore species
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D
Availability of nutrients
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Solution

The correct option is A Availability of nutrients
Net primary productivity refers to the biomass available for consumption. The annual net primary productivity of the whole biosphere is 170 billions tons of dry weight. The availability of the mineral nutrients in an environment determines productivity.
Hence, the correct answer is 'Availability of nutrients'

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