With regard to the biological nitrogen fixation by Rhizobium in association with soyabean, which one of the following statement/ statements does not hold true.
| 1. | Nitrogenase may require oxygen for its functioning. |
| 2. | Nitrogenase is Mo-Fe protein |
| 3. | Leg-haemoglobin is a pink coloured pigment. |
| 4. | Nitrogenase helps to convert N2 gas into two molecules of ammonia. |
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