Which of the Following Statements About Nitrogen Fixation in Root

Multiple Choice

Which of the following statements about nitrogen fixation in root nodules is correct?

A) The plant contributes the nitrogenase enzyme.
B) The process is relatively inexpensive in terms of ATP costs.
C) Leghemoglobin helps maintain a low oxygen concentration within the nodule.
D) The process tends to deplete nitrogen compounds in the soil.
E) The bacteria of the nodule are autotrophic.