Green manuring is the farming practice where a leguminous plant which has derived enough benefits from its association with appropriate species of Rhizobium, is ploughed into the field soil and then a non-legume is sown and allowed to get benefitted from the already present nitrogen fixer. Some legumes, such as Crotalaria juncea, are used as green manure. Rhizobia, that fix atmospheric nitrogen in the form of nitrate, live in the roots of leguminous plants. These nutrients are used by non-leguminous plants through the practice of green manuring.
Green manure plants belong to the family

Options

A. Lamiaceae
B. Papilionaceae
C. Liliaceae
D. Poaceae

Answer

B