Question

how do rhizobium bacteria and leguminous plants help each other in their survival

Answer 1

The rhizobium converts atmospheric nitrogen into ammonia which plants can use.
The plants provides bacteria the required nutrients for its growth.
In this way they help each other .

Answer 2

Rhizobium Bacterium and leguminous plant help each other in the survival ; as Rhizobium is a bacterium that lives in the roots of leguminous plants , it convert nitrogen from the atmosphere into a usual form that can be utilised by the plants. The plants, in turn provide food and shelter to the bacterium. As here we can also take an example of Lichens ( Algae and Fungi ) as we know that they are known for symbiotic relationship . This relationship refers when to organism in a close relationship and develop they are shelter , food , etc. as the same happens here with the algae and fungi (Lichens) ; here are the algae provide shelter to fungi , where as the fungi makes food for the algae. Thus , same the condition with rhizobium bacteria and leguminous plants.