Home Biology Ecosystem Structure and Function, Productivity and Decomposition It is estimated that 170 billion tonnes (dry…
Biology Ecosystem Structure and Function, Productivity and Decomposition Single Correct MCQ
Published on: August 21, 2026

It is estimated that 170 billion tonnes (dry weight) to organic weight is produced annually. What contribution in terms of billion tons is expected by oceans?

A
20
B
55
C
50
D
90

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The correct answer is:
B

Out of about 170 billion tonnes of annual global net primary production, oceans contribute approximately 55 billion tonnes.

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