The gross primary productivity of the ocean i | vedclass

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(B) The total biomass or organic matter produced per unit area over a time period by plants during photosynthesis is known as Gross Primary Productivi

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$55$

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(B) The total biomass or organic matter produced per unit area over a time period by plants during photosynthesis is known as Gross Primary Productivity $(GPP)$.According to the $NCERT$ textbook,the total annual net primary productivity of the whole biosphere is approximately $170$ billion tonnes (dry weight) of organic matter.Of this,the productivity of the oceans is only $55$ billion tonnes,despite the oceans covering about $70\%$ of the Earth's surface.Therefore,the correct value for the productivity of the ocean is $55$ billion tonnes.

The gross primary productivity of the ocean in billion tonnes is:

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