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Class 12BiologyEcosystemProductivity
Medium

The annual net primary productivity of the whole biosphere is approximately $...........$ (dry weight) of organic matter.

  • A
    $170$ million tonnes
  • B
    $170$ billion tonnes
  • C
    $70$ million tonnes
  • D
    $70$ billion tonnes
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Class 12 Questions

Class 12

Biology Questions

Chapter

Ecosystem

Subtopic

Productivity

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