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

question 43

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.

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