Rhizobium is a bacteria which can fix atmospheric nitrogen - True

Explanation:
Rhizobium is a type of bacteria that forms a symbiotic relationship with leguminous plants such as peas, beans, and clover. This bacterium has the unique ability to fix atmospheric nitrogen, which means it can convert the nitrogen gas (N2) present in the atmosphere into a form that can be utilized by plants.

What is Nitrogen Fixation?
Nitrogen fixation is the process by which atmospheric nitrogen is converted into a biologically useful form such as ammonia (NH3) or nitrate (NO3-). Nitrogen gas is abundant in the atmosphere, but it is not directly usable by most organisms. Therefore, certain bacteria, like Rhizobium, play a vital role in converting atmospheric nitrogen into a form that can be utilized by plants.

Symbiotic Relationship with Leguminous Plants:
Rhizobium forms nodules on the roots of leguminous plants. These nodules provide a specialized environment where the bacteria can thrive. In return, the bacteria provide the plants with a source of fixed nitrogen. This symbiotic relationship is beneficial for both the bacteria and the plants.

Nitrogenase Enzyme:
Rhizobium possess a unique enzyme called nitrogenase, which is responsible for the conversion of atmospheric nitrogen into a usable form. Nitrogenase works by breaking the strong triple bond between nitrogen (N2) molecules and combining them with hydrogen (H) to produce ammonia (NH3). Ammonia can then be further converted into other nitrogen compounds like nitrate (NO3-), which can be easily absorbed by plants.

Importance of Nitrogen Fixation:
Nitrogen fixation is crucial for maintaining the fertility of agricultural soils. Leguminous plants can fix nitrogen with the help of Rhizobium bacteria, which reduces the need for synthetic nitrogen fertilizers. This process also plays a significant role in the nitrogen cycle and helps in the overall balance of nitrogen in ecosystems.

Conclusion:
In conclusion, Rhizobium is indeed a bacteria that can fix atmospheric nitrogen. It forms a symbiotic relationship with leguminous plants and utilizes the enzyme nitrogenase to convert atmospheric nitrogen into a biologically useful form. This ability of Rhizobium is vital for the nitrogen cycle and agricultural sustainability.

Yeah,True