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This Concept Map, created with IHMC CmapTools, has information related to: 12.4 biogeochemical cycle(Heng Ann Nie 1M1S04), Reservoir pool -Contains organic&inorganic materials which cannot assimilated directly 2types of cycle Carbon cycle 1)photosynthesis(plant) 2)Diffusion(water) 3)Assimilation(when animals consume organism that consist of carbon) 4)Decomposion(detritivore/decomposer) 5)Fossilization( dead/decaying plants & animals) 6)Weathering(rocks-erosion) 7)Cellular Respiration 8)Human activities(combustion,factory,air pollution) **QUESTION:HOW IS CARBON ELEMENT RETURN TO ATMOSPHERE? ANS:BY CELLULAR RESPIRATION,DECOMPOSITION&COMBUSTION**, 12.4 Biogeochemical cycle -A cycle of chemical elements between living organisms/biotic component& /their non-living surrounding abiotic of an ecosystem. Cycling pool -Contains organic&inorganic materials that are directly available for use by organism. -Chemical elemant/nutrient in complex organic form long food chain in biotic component in biosphere.(photosynthesis only), 12.4 Biogeochemical cycle -A cycle of chemical elements between living organisms/biotic component& /their non-living surrounding abiotic of an ecosystem. Reservoir pool -Contains organic&inorganic materials which cannot assimilated directly, Reservoir pool -Contains organic&inorganic materials which cannot assimilated directly 2types of cycle Nitrogen cycle 1)Nitrogen fixation-Done by free-living nitrifying bacteria in soil(Azobacter,Clostridium)& by symbiotic bacteria(Rhizobium)[terrestrial ecosystem]. -Nitrogen is fixed by some blue green bacteria(cyanobacteria)[Aquatic ecosystem]. -lightning 2)Nitrification(Nitrosomonas sp.&Nitrobacter sp.) 3)Assimilation(feed in) 4)Ammonification(dead&decay plants&animals) 5)Denitrification(Pseudomonas denitrificans)-Dinitrifying bacteria found in places with low oxygen level. **Rhizobium bacteria:Bacteria living in nodules of legume plants,convertnitrogen into ammonia(NH3), then intothe ammonium ion(NH4+) with the addition of a hydrogenion(H+).(NH4+) ion enables the plant to make amino acid&proteins.The bacteria get carbohydrates from the plant.**