Question

110. The reductive step of nitrogen cycle is carried out
by how many micro-organisms mentioned below
in the box?
A
Frankia, Nitrobacter, Azospirillum,
Nitrosomonas, Rhizobium, Bacillus vulgaris,
Nitrococcus
(1) Six
(2) Two
(3) Three
(4) Five​

Answer 1

Answer:

In nitrogen cycle Nitrosomonas & Nitrobacter bacteria are responsible for nitrification) During nitrification, the nitrogenous wastes from dead plants and animals are converted into ammonia by the action of bacteria such as Bacillus ramosus, Clostridium spp. etc.

The microbes which carry out biological nitrogen fixation are commonly called biological nitrogen fixers. for eg: Rhizobium and Azotobacter.

So, the correct answer is 'Nitrosomonas & Nitrobacter'.

Answer 2

Answer:

The correct option is 2) Two.

Explanation:

• In nitrogen fixation, nitrogen gas is reduced to ammonia
• This step is carried out by the bacteria Bacillus vulgaris and frankia
• Molecular nitrogen in the air, which has a powerful triple covalent bond, is changed into ammonia or other related nitrogenous compounds by the chemical process known as nitrogen fixation, which normally occurs in soil or aquatic systems but can also occur in the industry.
• Ammonia can be produced from atmospheric nitrogen by specific bacteria and prokaryotes.
• The biological fixation of nitrogen is the name of this process.
• Dinitrogen is converted to ammonia by the enzyme nitrogenase.
• Free-living or symbiotic microorganisms that fix nitrogen are both possible.
• Azotobacter, Beijernickia, Rhodospirillum, and cyanobacteria are a few examples of free-living nitrogen fixers.
• Rhizobium bacteria are involved in nitrogen fixation.
• These microorganisms are found in the roots of legume plants

The reductive step of the nitrogen cycle is the step of nitrogen fixation.

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