Question

Function of red pigment leghaemoglobin present in root nodules of leguminous plants is to regulate

• A. $C{O}_2$ supply in cells
• B. Mo supply to cells
• C. $O_2$ supply to cells
• D. Production of phenolic compounds

Answer 1

The correct option is C $O_2$ supply to cells

The root nodules of the leguminous plants contain an oxygen-binding heme protein called leghemoglobin. It is present in the cytoplasm of infected nodule cells at high concentrations. This leghemoglobin has a high affinity for oxygen, (approximately, ten times higher than the ß chain of human hemoglobin). Its function is to help transport oxygen to the respiring symbiotic bacterial cells in a manner analogous to hemoglobin transporting oxygen to respiring tissues in animals. Thus, it regulates oxygen supply to the cells.

Thus, the correct answer is option (C).