While rhizobia usually associate with plant roots, nodules can also be formed along the stems of leguminous plants.

Question

Quizplus · Accepted Answer

This statement is true. Nodules can form along the stems of leguminous plants in addition to the roots. This process is known as stem nodulation and is a rare occurrence in legumes. It is more commonly found in certain parasitic plants such as the cowpea and bird's foot trefoil.

While Rhizobia Usually Associate with Plant Roots, Nodules Can Also