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    Question

    Which of the following is an essential element used in

    the synthesis of proteins and other compounds?
    A Phosphorus Correct Answer Incorrect Answer
    B Iron Correct Answer Incorrect Answer
    C Magnesium Correct Answer Incorrect Answer
    D Nitrogen Correct Answer Incorrect Answer

    Solution

    Although all of the elements above are used by plants and taken up via the soil, nitrogen is especially essential and used specifically for the for the synthesis of proteins and other compounds. It is taken up in the form of inorganic nitrates or nitrites. Or it is taken up as organic compounds which have been prepared by bacteria from atmospheric nitrogen. Hence, option D is correct.

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