試題詳解

11. Which of the following descriptions about nitrogen cycle is NOT correct?
(A) The nitrogenous wastes in animal urine are broken down by denitrifying bacteria.
(B) Nitrous oxide (NzO), carbon dioxide and methane are greenhouse gases that contribute to global warming.
(C) Nitrous oxide (N2O) has risen in the atmosphere as a result of agricultural fertilization, biomass burning, cattle and feedlots, and industrial sources.
(D) Atmospheric ammonia and nitrous oxides contribute to smog and acid rain, damage plants and increase nitrogen inputs to ecosystems.
(E) Nitrogen cannot be utilized by phytoplankton as nitrogen gas (N2) so it must undergo nitrogen fixation which is performed predominately