A) Net primary productivity
B) Gross primary productivity
C) Net secondary productivity
D) Gross secondary productivity
Correct Answer: B
Solution :
Primary production is the synthesis of organic compounds from atmospheric or aqueous carbon dioxide. It principally occurs through the process of photosynthesis, which uses light as its source of energy, but it also occurs through chemosynthesis, which uses the oxidation or reduction of inorganic chemical compounds as its source of energy. Almost all life on earth is directly or indirectly reliant on primary production.
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