Question

We can find nitrogen-fixing bacteria

• A. On the stems of some plants.
• B. In the leaves of trees.
• C. In the nodules of some plants.
• D. On atmospheric dust particles.
• E. In blue-green algae.

Answer 1

The correct option is C In the nodules of some plants.

There are two types of nitrogen fixing bacteria one is free-living bacteria like cyanobacteria (nostoc) and another one is symbiotic bacteria like Rhizobium. Rhizobium forms a symbiotic association with the roots of leguminous plants for nitrogen fixation. Thus, the correct answer is option C.