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 $C$.

List-$I$ (Process)	List-$II$ (Definition)
$A$. Productivity	$I$. Gross primary productivity minus respiration losses
$B$. Net primary productivity	$II$. Rate of formation of new organic matter by consumers
$C$. Gross primary productivity	$III$. Rate of biomass production
$D$. Secondary productivity	$IV$. Rate of production of organic matter during photosynthesis

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

Similar Questions

Which of the following is the unit of productivity of an ecosystem?

The rate of formation of new organic matter by a rabbit in a grassland is called:

Distinguish between:
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$(b)$ Primary and secondary productivity

Primary productivity varies from ecosystem to ecosystem. Explain.

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