Where are Rhizobium bacteria found?

A. leguminous plants की root nodules में / In root nodules of leguminous plants

Step 1: Identify the concept: this is about useful bacteria. Step 2: Rhizobium lives in roots of leguminous plants and helps in nitrogen fixation. Step 3: Remember Rhizobium equals root nodule nitrogen fixer.

Step 1: concept पहचानें: यह useful bacteria है। Step 2: Rhizobium leguminous plant roots में रहकर nitrogen fixation में मदद करता है। Step 3: Rhizobium equals root nodule nitrogen fixer याद रखें।