[Campbell Biology P.865] What is the primary role of leghemoglobin in root nodules? | Practice Question

What is the primary role of leghemoglobin in root nodules?

  • A: To supply fixed nitrogen to the plant.
  • B: To bind reversibly to oxygen, creating an anaerobic environment.
  • C: To transport carbohydrates from the plant to the bacteria.
  • D: To stimulate root hair elongation.

Explanation

Leghemoglobin acts as an oxygen "buffer," reducing the concentration of free oxygen and thereby providing an anaerobic environment for nitrogen fixation, which is crucial for the nitrogenase enzyme.