The net primary productivity of the oceans is | vedclass

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(C) The total net primary productivity of the entire biosphere is approximately $170$ billion tonnes (dry weight) of organic matter per year.Out of th

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$55$ billion tonnes

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(C) The total net primary productivity of the entire biosphere is approximately $170$ billion tonnes (dry weight) of organic matter per year.Out of this,the productivity of the oceans is only $55$ billion tonnes.Despite occupying about $70\%$ of the Earth's surface,the productivity of oceans is relatively low compared to terrestrial ecosystems due to light limitation and nutrient availability in deeper waters.Therefore,the correct option is $C$.

The net primary productivity of the oceans is ............ .

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