Gold is found in stem of which plant ?

Equisetum.
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Who discovered biological nitrogen fixation ?

Hermann Hellriegel and Martinus Beijerinck.
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Name the best known symbiotic nitrogen fixing bacterium.

Rhizobium leguminosarum.
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What is theultimate product of nitrogen fixation?


Ammonia.
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Which kind of plants harbour nitrogen fixing bacteria in their root nodules ?

Leguminous plants.
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