The Annual Net Primary Productivity on land and ocean respectively are ____ and ____ billion tons.

Step-by-step solution

The annual net primary productivity of the whole biosphere is approximately 170 billion tons (dry weight) of organic matter. Out of this total, the productivity of the oceans is only 55 billion tons, despite occupying about 70 percent of the Earth's surface. The productivity on land is the remaining amount, which is 170 - 55 = 115 billion tons. Therefore, the annual net primary productivity on land and ocean respectively are 115 and 55 billion tons. Answer: 115, 55