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is a free-living N(2)-fixing aerobic bac...

_______is a free-living `N_(2)`-fixing aerobic bacterium.

A

Rhodospirillum

B

Azotobacter

C

Clostridium

D

Rhizobium

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The correct Answer is:
B
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(i) Anabaena lives symbiotically with Azolla. (ii) Azotobacter is a free-living N_(2) fixer in the soil. Which of the statements given above is/are correct?

NCERT FINGERTIPS-MINERAL NUTRITION-Mineral Nutrition
  1. if by radiation all nitrogenase enzyme is inactivated, then there will...

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  2. A farmer adds Azotobacter culture to soil before sowing maize. Which m...

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  3. is a free-living N(2)-fixing aerobic bacterium.

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  4. Which of the following is a non-symbiotic nitrogen fixing prokaryote?

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  5. Which of the following is a free-living nitrogen fixing cyanobacteria?

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  6. Symbiotic bacteria are found in the root nodules of members family

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  7. The bacteriumbelonging to group actinomycetes, produces N(2)-fixing no...

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  8. Select the mismatched pair.

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  9. Certain non-leguminous plants also form nodules to fix N(2). Example o...

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  10. N(2)-fixing blue-green alga Anabaena which is extensively used in rice...

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  11. The nodules present in the leguminous plants appear pink in colour due...

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  12. During nodule formation in leguminous plants, an infection thread is p...

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  13. Refer to the given figure and select the correct option.

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  14. Study the given figures carefully showing the development of root nodu...

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  15. What dows the given figure represent?

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  16. During N(2) fixation, reduction of one molecule of nitrogen into 2 mol...

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  17. Which one is the correct equation of nitrogen fixation?

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  18. The cofactor of nitrate reductase is

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  19. Leghaemoglobin is produced in response to

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  20. Which of the following statements is incorrect about leghaemoglobin?

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