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Question

Nif gene occurs in which of the following


A

Penicillium

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B

Aspergillus

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C

Streptococcus

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D

Rhizobium

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Solution

The correct option is D

Rhizobium


The correct option is D.

Explanation for the correct option:

Option D:

  1. The genes that encode enzymes involved in nitrogen fixation are known as nif genes.
  2. They are found in both symbiotic and free-living nitrogen-fixing bacteria.
  3. Rhizobium is a nitrogen-fixing bacteria that is found in the roots of leguminous plants.

Explanation for the incorrect options:

Option A:

Penicillium is a fungus that is involved in food spoilage and is also used in the production of antibiotics, but it has no role in nitrogen fixation.

Option B:

Aspergillus is a fungus and is used for biotransformations and waste management but it has no role in nitrogen fixation.

Option C:

Streptococcus is a genus of bacteria that can cause pneumonia and is also used in milk, and dairy products but it has no role in nitrogen fixation.

Final answer: Nif gene occurs in Rhizobium.


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