Question

Plants require nitrogen along with carbohydrates. This nitrogen can be obtained by

• A. Rhizobium
• B. Vibrio
• C. Salmonella
• D. Felix

Answer 1

The correct option is A Rhizobium

Rhizobium is a nitrogen-fixing bacteria found in symbiotic association with the root nodules of leguminous plants.

For nitrogen fixation rhizobium needs an oxygen-free environment because oxygen acts as a poison and so it forms the association because the root nodules contain leg hemoglobin which is an oxygen scavenger.

In return the plant gets Nitrogen.

So, the correct option is 'Rhizobium'