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Answer:

diazotrophs

Explanation:

Nitrogen fixation is carried out naturally in soil by microorganisms termed diazotrophs that include bacteria such as Azotobacter and archaea. Some nitrogen-fixing bacteria have symbiotic relationships with plant groups, especially legumes.

Diazotrophs are the organism that carries out most nitrogen fixation.

What is nitrogen fixation?

"It is the process by which the atmospheric nitrogen that is in molecular form is converted into compounds that can be absorbed and utilized by the plants."

What is biological nitrogen fixation?

  • It was discovered by Beijerinck in 1901.
  • When living organism perform nitrogen fixation it is known as biological nitrogen fixation.

What are diazotrophs?

  • They include the organisms that are either bacteria or archaea.
  • They can fix the atmospheric nitrogen into ammonia or other forms that can be used by plants.

What are the examples of diazotroph?

Examples are Frankia, Rhizobium, Bradyrhizobium, Azospirillum, etc.

To learn more about nitrogen fixation, nitrogen and diazotrophs here,

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