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CYCLING IN THE ECOSYSTEM
18.4 pp
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DEFINITIONS Ecosystem: an environment where the living (biotic) and non-living (abiotic) things affect one another Biogeochemical process: circulation of substances through living organisms and the environment
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1. WATER CYCLE
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1. WATER CYCLE Evaporation: water vapor enters the atmosphere
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1. WATER CYCLE Evaporation: water vapor enters the atmosphere
Transpiration: evaporation of water through the leaves of plants
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1. WATER CYCLE Precipitation: water vapor that leaves the atmosphere (rain and snow)
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2. Oxygen Cycle Plants release O2 as a waste product during photosynthesis oxygen respiration carbon dioxide photosynthesis
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2. Oxygen Cycle Plants release O2 as a waste product during photosynthesis Humans and other organisms take in O2 and release it as CO2 oxygen respiration carbon dioxide photosynthesis
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3. CARBON CYCLE
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3. CARBON CYCLE Photosynthesis: converting light energy into organic compounds (C6H12O6)
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3. CARBON CYCLE Cellular respiration: breaking down organic compounds to release energy (C6H12O6 CO2 + H2O + ATP)
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3. CARBON CYCLE Combustion: burning of fossil fuels for energy releases CO2
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4. NITROGEN CYCLE 70% of atmosphere is nitrogen, but it is not in a ready to use form N2 needs to converted into NH3 (ammonia)
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4. NITROGEN CYCLE Bacteria and decomposers play major role.
Takes place mostly below ground.
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4. NITROGEN CYCLE Plant takes in N from soil
Herbivore eats plant and gets N Organism dies and N is released by bacteria and decomposer in soil for Plant
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