Question

why is leg haemoglobin is called oxygen scavenger?

Answer 1

Answer:

Leg haemoglobin is a oxygen carrying hemoprotein found in the root nodules of the leguminous plants. It is produced in response to the roots being colonized by nitrogen- fixing bacteria called as rhizobia. It is produced as a result of symbiotic relationship between plant and the bacteria.

It maintains the level of oxygen in the root nodules. It has an affinity for oxygen. It maintains the concentration of oxygen in the root nodules low and releases the oxygen to the external environment of the root, which facilitates respiration by bacteria. As, high oxygen concentration prevents the presence of oxygen will prevent the activity of enzyme oxygen sensitive nitrogenase, which is an enzyme performs the function of fixation of atmospheric nitrogen.

Answer 2

Leghemoglobin Supports In Plant

Explanation:

1. In plants colonized by Rhizobium, for example, horse feed or soybeans, the nearness of oxygen in the root knobs would decrease the movement of the oxygen-delicate nitrogenase, which is a compound liable for the obsession of climatic nitrogen.
2. Leghemoglobin supports the centralization of free oxygen in the cytoplasm of tainted plant cells to guarantee the best possible capacity of root knobs.
3. Leghemoglobin has a high liking for oxygen (Km~ 0.01 µM), around multiple times higher than the β chain of human hemoglobin.
4. This permits an oxygen focus that is sufficiently low to permit nitrogenase to work, yet sufficiently high that it can furnish the microscopic organisms with oxygen for breath.  
5. Oxygen restricting limit of Hb additionally relies upon the encompassing pH (Decrease in pH prompts lesser oxygen restricting limit of Hb-Bohr's impact).  
6. Carbon dioxide from the breathing cells diffuse into the blood and brings down the pH of the blood which empowers Hb to discharge oxygen.