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    Question

    In a process of global nitrogen cycle which among the

    following is not the key step?
    A Fixation of atmospheric N₂ to NH₃ and NH₄ and by bacteria Correct Answer Incorrect Answer
    B Denitrification of nitrate by bacteria back to N₂ Correct Answer Incorrect Answer
    C Nitrification of these molecules to nitrate by bacteria Correct Answer Incorrect Answer
    D Nitrate oxidation by plants Correct Answer Incorrect Answer

    Solution

    The correct answer is D

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