Question

Nif gene occurs in which of the following

• A. Penicillium
• B. Aspergillus
• C. Streptococcus
• D. Rhizobium

Answer 1

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.