Post on 09-Aug-2015
transcript
C.6 The Nitrogen & Phosphorus Cycles(AHL)
IB Biology
R. Price
v. 1 2015
Allott, 649
#1 Nitrogen-fixing bacteria convert atmospheric nitrogen to ammonia#2 Rhizobium associates with roots in a mutualistic relationship#3 In the absence of oxygen, denitrifying bacteria reduce nitrate in the soil
Nitrogen-fixing bacteria convert atmospheric nitrogen to ammonia Use the following terms in the diagram below illustrating how bacteria converts nitrogen to ammonia:
N2 Rhizobium Azotobacter NH3 nodule carbohydrate
Nitrogen Cycle Use the following terms in the diagram below illustrating the nitrogen cycle: Nitrate(NO3-) Nitrite(NO2-) Nitrosomonas Pseudomonas denitrificans Rhizobium
The Phosphorus CycleUse the following terms in the diagram below illustrating the phosphorus cycle: dissolved in waterways
mining (fertilizers & detergents) phosphate in soil
shallow ocean sediments
weathering
#5 The rate of turnover in the phosphorus cycle is much lower than the nitrogen cycle
#4 Phosphorus can be added to the phosphorus cycle by application of fertilizer or removed by the harvesting of agricultural crops#6 Availability of phosphate may be limiting to agriculture in the future.
Sources
Content Allott, Andrew, and David Mindorff. Biology: Course Companion. 2014 ed. Oxford: Oxford UP, 2014. Print. Oxford IB Diploma Programme.
Hebrank, Mary. Teach Engineering. 2013. Regents of the University of Colorado. https://www.teachengineering.org/view_lesson.php?url=collection/duk_/lessons/duk_cellresp_mary_less/duk_cellresp_mary_less.xml
Walpole, Brenda. Biology for the IB Diploma. 2nd ed. Cambridge: Cambridge UP, 2014. Print.
ImagesUnless otherwise noted, images are obtained from Pixabay (www.pixabay.com) and used under the CC0 Public Domain license.