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Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYMicrobes in Human Welfare1 Mark
MCQ
Leghaemoglobin takes part in:
  • A
    Energy release
  • B
    Stimulating growth of Rhizobium
  • C
    N2​ absorption
  • D
    Protecting nitrogenase
✓

Answer

  1. Protecting nitrogenase

Explanation:

The pink color, typical of healthy and effective nodules, is due to the presence of a protein called leghemoglobin. This special protein contains Iron (Fe) and molybdenum (Mo) and is responsible for binding oxygen. This provides sufficient oxygen for the metabolic functions of the bacteroids but prevents the accumulation of free oxygen that would destroy the activity of nitrogenase.

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