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      Question

      In greengram, nitrogen fixation starts at the age

      of
      A 12-15 days Correct Answer Incorrect Answer
      B 18-21 days Correct Answer Incorrect Answer
      C 24-27 days Correct Answer Incorrect Answer
      D 30-30 days Correct Answer Incorrect Answer

      Solution

      In greengram (mung bean), nitrogen fixation typically starts at the age of 18-21 days. This is when the nodules on the roots of the plant begin to form and establish a symbiotic relationship with nitrogen-fixing bacteria (rhizobia).

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