Although oceans cover about seventy per cent of the surface, their pro…

Question

Although oceans cover about seventy per cent of the surface, their productivity is only:

Accepted Answer

D. 55 billion tons

1. Ocean area is far larger than land area.
2. Ocean productivity per unit area is nonetheless much lower.
3. Despite occupying about 70 per cent of the surface, ocean productivity is only 55 billion tons.
4. So most primary production happens on land.
_Source: syllabus Biology, Ch 12 'Ecosystem'_

Answer

95 billion tons

Answer

155 billion tons

Answer

255 billion tons

Although oceans cover about seventy per cent of the surface, their productivity is only:

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