Nitrogen fixing bacterium is

Frankia

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Acetobacter

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Mycoplasma

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Chlamydia

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Solution

The correct option is A Frankia
Nitrogen-fixing bacteria is Frankia. It is symbiont in root nodules of several nonlegume plants like casuarina and Alnus.
Acetobacter is acetic acid synthesising bacteria.
Mycoplasma is the smallest organisms known. They are the disease-causing microbes.
Chlamydia is the bacteria causing Chlamydiasis disease in the reproductive tract.
Thus the correct answer is option A.

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