Why is nitrogen the limiting nutrient in most ecosystems? Choose one: A. Nitrogenase, the enzyme required to fix nitrogen, is only present in mycorrhizal fungi. B. It requires large amounts of energy to be fixed. C. Organisms can only assimilate it into biomass in the NO3- form. D. It is present in the atmosphere in only small quantities.
Added by Eugenia E.
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Nitrogenase is not only present in mycorrhizal fungi, but also in nitrogen-fixing bacteria. So, this option is incorrect. B. Nitrogen fixation does require a significant amount of energy, as nitrogen gas (N2) is very stable and must be converted into a Show more…
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Nitrogen is often a limiting nutrient in many ecosystems because a. there is much less nitrogen in the atmosphere than carbon. b. elemental nitrogen is very rapidly used by most organisms. c. nitrogen availability is being reduced by pollution due to fertilizer use. d. most organisms cannot use nitrogen in its elemental form.
Which of the following is NOT a reason for why nitrogen is important to life on Earth? a. Nitrogen is used to make organic matter, including proteins. b. Consumers obtain nitrogen into their bodies by eating organisms that contain nitrogen, such as plants. c. All of these are important to life. d. Nitrogen is a necessary nutrient for plants.
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