BIO-L111 Take Home Lecture 22
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Created by:
laurened193 on December 10, 2011
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15 terms
Terms | Definitions |
|---|---|
 main reserve of phosphorus exists in | the earth's crust |
| how is phosphorus cycled back into the soil? | 1. weathering and erosion release phos. into the soil. 2. animals consume phosphorus and after they excrete it, it is decomposed back into the soil. |
| How do plants acquire their phos? | absorb ionized forms of it (phosphate) |
| Herbivores get their phosphorus by_____. | from eating plants |
| relationship b/w primary production and total phosphorus concentration. | as primary production of phosphorus inc, phos. concentration inc. too |
| main reserve of carbon exists in______. | rocks and fossil fuels |
| How is carbon cycled b/w atmosphere and organisms? | 1. plants-absorb CO2 from atmosphere via photosynthesis releasing O2 into the atmosphere. 2. Organisms breath in O2 and breath out CO2 via respiration decomposition? |
| Fossil fuels | gas, goal, and oil that form from decomposition of dead organisms |
| nitrogen | not readily available for use by most organisms |
| nitrogen fixation | the process by which bacteria convert N2 (atmospheric nitrogen) into forms usable by other organisms (NH3 or NH4+) |
| nitrification | bacteria convert NH3 or NH4+ to nitrate (NO3-) which can be used by plants |
| assimilation | where inorganic substances are incorporated into organic molecules -conversion of nutrients into usable forms ex: organisms assimilate nitrogen by taking up NH3, NH4, and NO3- and incorporating them into other molecules |
| how do humans get nitrogen? | through eating foods with nitrogen |
| effects of deforestation on nutrient concentration | deforestation-causes nutrients levels to significantly increase |
| main phenomena responsible for the movement of water within the global ecosystem | evaporation and percipitation |
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