Question

Which of the following is a nitrogen fixing organism?

• A. Aspergillus
• B. Rhizobium
• C. Both A and B
• D. None of the above

Answer 1

The correct option is B

Rhizobium

The correct option is B

The explanation for the correct option:

1. Nitrogen fixation is a process by which nitrogen gas from the atmosphere gets converted into a usable form.
2. Rhizobium is a nitrogen-fixing bacteria as it fixes nitrogen after it gets established in the root nodules of leguminous plants.

The explanation for the incorrect option

Option A

Aspergillus is a fungus and does not able to fix the atmospheric nitrogen

Option C

Both A and B are incorrect options because Aspergillus is a fungus and can not fix atmospheric nitrogen whereas rhizobium can fix the atmospheric nitrogen.

Final answer: Rhizobium is the nitrogen-fixing organism.