Although oceans cover about seventy per cent of the surface, their productivity is only:
A95 billion tons
B155 billion tons
C255 billion tons
D55 billion tons
Answer & Solution
Correct 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: NCERT Class XII Biology, Ch 12 'Ecosystem'_
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