Which of these nitrogen-fixing bacteria does not live in symbiotic ass

1.	Which of these nitrogen-fixing bacteria does not live in symbiotic association with host plant?(a) Rhizobium(b) Azotobacter(c) Frankia(d) Xanthomonas
Answer» Answer is : (b) Azotobacter Azotobacter, a free-living nitrogen-fixing bacterium does not form any association with the host plant. Rhizobium, Frankia, Xanthomonas are symbiotic nitrogen-fixing bacteria that live in a mutualistic association with the host plant. These live in small knob-like protuberances known as nodules.

Which of these nitrogen-fixing bacteria does not live in symbiotic association with host plant?(a) Rhizobium(b) Azotobacter(c) Frankia(d) Xanthomonas

Answer»

Answer is : (b) Azotobacter

Azotobacter, a free-living nitrogen-fixing bacterium does not form any association with the host plant. Rhizobium, Frankia, Xanthomonas are symbiotic nitrogen-fixing bacteria that live in a mutualistic association with the host plant. These live in small knob-like protuberances known as nodules.

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Which of these nitrogen-fixing bacteria does not live in symbiotic association with host plant?(a) Rhizobium(b) Azotobacter(c) Frankia(d) Xanthomonas

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