試題詳解

49. Nitrogen fixation is observed in some plant species. Which one of the following statement is correct about nitrogen fixation?
(A) N₂ will be converted to NO₃^- .
(B) Nitrifying bacteria are able to fix nitrogen gas.
(C) This occurs in aerobic environment.
(D) This may produce hydrogen gas.
(E) This is catalyzed by nitrate reductase.