An association between the root nodule of a leguminous plant and rhizobium sp, is known as

The association between the root nodule of a leguminous plant and Rhizobium sp. is an example of symbiosis. Symbiosis is a relationship between two organisms of different species that benefits at least one of the organisms involved. In the case of the leguminous plant and Rhizobium sp., the plant provides a home for the bacteria within its root nodules. The bacteria, in turn, help the plant to fix atmospheric nitrogen, which is essential for plant growth. This is done through a process called nitrogen fixation, which converts nitrogen gas from the air into a form that can be used by the plant. Therefore, the correct answer to the question is: The association between the root nodule of a leguminous plant and Rhizobium sp. is an example of symbiosis.