Question

Which of the following fixes nitrogen in waterlogged soil?
(a) Nostoc
(b) Nitrobacteria
(c) Clostridium
(d) None of the above

Answer 1

Answer:

Nostoc

Explanation:

Certain bacteria are capable of fixing nitrogen. In this process, nitrogen gas is converted to ammonium, a form of nitrogen that is biologically available to plants. The reaction is catalyzed by the enzyme nitrogenase. Because nitrogenase is inactivated by oxygen, the reaction must occur in a low oxygen environment.

Bacterial nitrogen fixation is carried out by both free-living and symbiotic bacteria, e.g., Cyanobacteria (Anabaena, Nostoc), Azotobacter  and Clostridium.

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Answer 2

${ \sf{ \color{maroon}{Question :−}}}$

Which of the following fixes nitrogen in waterlogged soil?

(a) Nostoc ✔

(b) Nitrobacteria

(c) Clostridium

(d) None of the above

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${ \sf{ \color{maroon}{Reason:−}}}$

• Nostoc takes nitrogen gas from the atmosphere and 'fixes' it into a form that plants and animals can use.

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