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Which among the following does not come under the factors affecting primary productivity? 

(a) Environmental factor 

(b) Nutrients availability 

(c) Photosynthetic efficiency of plants 

(d) Leaching

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Correct option: (d) Leaching

Leaching does not come under the factors affecting primary productivity. It is the process, by which water soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts.

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