With regard to biological nitrogen fixation by Rhizobium in association with Soyabean, one of the following statements does not hold true.

Question

$\begin{array}{1 1} \text{a. Nitrogenase may require oxygen for functioning.} \\ \text{b. Nitrogenase is a Mo-Fe protein.} \\ \text{c. Leg haemoglobin is a pink coloured pigment.} \\ \text{d. Nitrogenase helps to convert Nitrogen gas into two molecules of ammonia.} \end{array} $