Question

which is an nitrogen fixation bacteria ? where are they present ?
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Answer 1

Answer:

Rhizobium bacteria and blue green algae which are present in roots of leguminous plants.

Answer 2

Nitrogen-fixing bacteria are prokaryotic microorganisms that are capable of transforming nitrogen gas from the atmosphere into “fixed nitrogen” compounds, such as ammonia, that are usable by plants.

There are two main types of nitrogen-fixing bacteria. Symbiotic, or mutualistic, species live in root nodules of certain plants. Plants of the pea family, known as legumes, are some of the most important hosts for nitrogen-fixing bacteria, but a number of other plants can also harbour these helpful bacteria. Other nitrogen-fixing bacteria are free-living and do not require a host. They are commonly found in soil or in aquatic environments.