SWS3022 Exam 3 Questions with Complete Solutions
What element is strongly limiting to primary productivity? - Answer-Nitrogen
What is the basic criteria for diagnosis of N deficiency in plants? - Answer-Yellowing in older tissues
What is the organic nitrogen presented and what is it called...
What element is strongly limiting to primary productivity? - Answer-Nitrogen
What is the basic criteria for diagnosis of N deficiency in plants? - Answer-Yellowing in
older tissues
What is the organic nitrogen presented and what is it called? - Answer-R-NH2, amine
What is deamination and what is its product? - Answer-Strictly applies to nitrogen
conversion. When organic nitrogen is converted into inorganic forms in soils. Produces
the mineral: NH4
What is nitrification and the conditions necessary? - Answer-NH4 is converted to NO3-
by specific microorganisms. Aerobic bacteria, thereofre controlled by oxygen levels.
Also controlled by pH.
Under what conditions the inorganic forms of nitrogen dominate in soils? - Answer-NH4
is dominant at low pH, so low O2.
NO3- is dominant at high pH, so high O2.
Know the relative mobilities of ammonium vs. nitrate in soils. - Answer-Nitrate is more
mobile in the environment.
What is the process of eutrophication? - Answer-Nutrients> stimulation of productivity >
algae death > high amounts of organic dtritus > consumption by aerobic heterotrophic
organisms > consumption of oxygen > depressed O2 levels
What is the basic symbiotic relationship between plants and rhizobia and the benefits to
both? - Answer-Plants signal inviting rhizobia to colonize the root. Rhizobia signal to
plant to produce area to colonize. Plants get N, bacteria get C.
What are the three primary macronutrients? - Answer-Nitrogen, phosphorous,
potassium
Which primary macronutrient is most limiting to plant productivity? - Answer-Nitrogen
What is the C:N ratio in a typical microorganisms? - Answer-8:1
What is the C:N ratio preferred by organisms for their food? - Answer-24:1. 2/3s is lost
to CO2
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