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Leghaemoglobin in a legume root nodule functions to

  • A.Store ammonia in the nodule until the plant needs it
  • B.Protect nitrogenase by keeping free oxygen very low
  • C.Carry nitrogen gas from the soil to the bacteroids
  • D.Give the nodule the structural strength it needs

Answer: B

Nitrogenase is irreversibly inactivated by oxygen, so the nodule uses leghaemoglobin to bind oxygen tightly and deliver it to respiring bacteroids while keeping the free concentration near zero. The pink colour of a healthy cut nodule comes from this pigment.

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