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Which of the following type of productivity counts the total fixation of energy by photosynthesis?

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Which of the following type of productivity counts the total fixation of energy by photosynthesis?

(a) Secondary productivity

(b) Primary productivity

(c) NPP

(d) GPP

I got this question in unit test.

The question is from The Ecosystem Concept in section Ecology of Life Sciences

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Best answer
Right choice is (d) GPP

The best explanation: GPP is gross primary productivity, which is a measure of total fixation of energy by means of photosynthesis.

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