Ncert Exercises & Solutions

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.

The enzyme, nitrogenase which is capable of nitrogen reduction is present exclusively in prokaryotes (e.g., Rhizobium). It is highly sensitive to O₂ and gets inactivated when exposed to it, thus does not require oxygen for its functioning. Other statements (b), (c) and (d) are true.

Page 203, XI NCERT

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