When Legumes with Nitrogen-Fixation Nodules Are Given Chemical Fertilizers with High

Multiple Choice

When legumes with nitrogen-fixation nodules are given chemical fertilizers with high nitrogen concentrations,they abandon support of the nodules and end the symbiosis.Why?

A) The mineral nutrients inhibit nitrogenase activity.
B) Nitrogen gas is no longer available in the soil.
C) The plant can conserve valuable energy sources by terminating the symbiotic relationship.
D) The dissolved chemical nutrients are toxic to Rhizobium bacteria.
E) Dissolved nitrogen uncurls the root hairs,releasing the nodule.