51. Which of the following statements concerning biogeochemical cycles is NOT correct?
(A) Plants and algae can use two inorganic forms of nitrogen: ammonium and nitrate.
(B) Photosynthesis by plants and phytoplanl.1:on removes substantial amounts of atmospheric C02 each year.
(C) The largest accumulations of phosphorus are in sedimentary rocks of marine origin. There are also large quantities ofphosphorus in soils, in the oceans and in organisms.
(D) Under anaerobic conditions, nitrifying bacteria use N03- in their metabolism instead of 0 2, releasing N2 in a processknown as nitrification.
(E) The major pathway for nitrogen to enter an ecosystem is via nitrogen fixation, the conversion ofN2 by bacteria tofonns that can be used to synthesize nitrogenous organic compounds.