Question

Write how bacteria help in nitrogen fixation​

Answer 1

Explanation:

nitrogen-fixing bacteria, microorganisms capable of transforming atmospheric nitrogen into fixed nitrogen (inorganic compounds usable by plants). More than 90 percent of all nitrogen fixation is effected by these organisms, which thus play an important role in the nitrogen cycle

Two kinds of nitrogen-fixing bacteria are recognized. The first kind, the free-living (nonsymbiotic) bacteria, includes the cyanobacteria (or blue-green algae) Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia, and Clostridium. The second kind comprises the mutualistic (symbiotic) bacteria; examples include Rhizobium, associated with leguminous plants (e.g., various members of the pea family); Frankia, associated with certain dicotyledonous species (actinorhizal plants); and certain Azospirillum species, associated with cereal grasses.

Answer 2

• Microorganisms that can convert atmospheric nitrogen into fixed nitrogen are known as nitrogen-fixing bacteria (inorganic compounds usable by plants).
• These species are responsible for more than 90% of all nitrogen fixation, making them vital to the nitrogen cycle.
• There are two types of bacteria that fix nitrogen.
• The cyanobacteria (or blue-green algae) Anabaena and Nostoc, as well as genera like Azotobacter, Beijerinckia, and Clostridium, belong to the first group of bacteria, the free-living (nonsymbiotic) bacteria.
• Rhizobium, which is associated with leguminous plants (e.g., various members of the pea family), Frankia, which is associated with certain dicotyledonous species (actinorhizal plants), and certain Azospirillum species, which are associated with cereal grasses, are examples of mutualistic (symbiotic) bacteria.