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10 Cards in this Set
- Front
- Back
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Symbiosis
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-Two differing organisms living together in close association that is beneficial to one or both of them
-Examples of animal-microbe symbiosis: -->ruminants (such as sheeps and cows) and the bacteria in the rumen -->Mycorrhizae: contribute to plant growth |
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Mycorrhizae
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-Fungi living in close association with plant roots
-Extend surface area of roots |
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Biogeochemical Cycles
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-Recycling (oxidation and reduction) of chemical elements
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The Carbon Cycle
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-Carbon Dioxide= greenhouse gas
-green house gas traps heat -green house effect is good for the world -too many gases= too warm -CO2 removed from atmosphere during photosynthesis -CO2 released during cellular respiration, fermentation, &burning *look at figure 27.3!! |
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Nitrogen Cycle
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Nitrogen gas is most abundant gas
-80% *look at figure 27.4!! |
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Nitrogen Fixation
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N2---->Ammonia (NH3)
In root nodules -Rhizobium -Bradyrhizobium -Frankia |
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Formation of a Root Nodule
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**look at figure 27.5!!
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Nitrogen Fixation
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In lichens
-Cyanobacteria |
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Decomposition by Microbes
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-Bioremediation: use of microbes to detoxify or degrade polluatants; enhaced by nitrogen and phosphorus fertilizer
-Bioaugmentation: addition of specific microbes to degrade of pollutant -Composing: arranging organic waste to promote microbial degradation by thermophiles |
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Eutrophication
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Overabundance of nutrients in lakes and streams
Caused by -addition of organic matter -or inorganic matter --->Phosphates --->Nitrogen --->which cause algal blooms Bacterial decomposition of organic matter uses up oxygen in water |
