The annual net primary productivity of the oceans is

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higher than the land because they occupy greater surface of the Earth

lower than the land because they occupy lesser surface of the Earth

lower than the land due to light-limitation and nutrient-limitation

higher than the land due to the abundance of water and nutrients

answer is C.

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Detailed Solution

The annual net primary productivity of the whole biosphere is approximately 170 billion tons (dry weight) of organic matter. Of this, despite occupying about 70 per cent of the surface, the productivity of the oceans are only 55 billion tons.The productivity in oceans is limited by the limited availability light, nutrients etc.

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