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      Question

      Which of the following is a characteristic feature of a

      legume root nodule infected by Rhizobium, allowing for effective nitrogen fixation?
      A Absence of vascular tissue Correct Answer Incorrect Answer
      B Presence of leghemoglobin Correct Answer Incorrect Answer
      C Lack of bacterial cells Correct Answer Incorrect Answer
      D High pH environment Correct Answer Incorrect Answer

      Solution

      Leghemoglobin is an oxygen-binding protein in nodules that regulates oxygen supply for nitrogenase, the enzyme responsible for nitrogen fixation. It gives the nodule a pinkish color and enables efficient N₂ fixation.

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