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  1. Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?

    2. A.

     By cyanobacteria
    B.

     By electrical discharges in the atmosphere
    C.

     By industrially synthesised fertilizer
    D.

     By denitrification

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    Answer : Option D

    Explanation :

    Nitrogen is not fixed in ecosystems by denitrification.

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