1. Photosynthesis
CO2 + H20 -(chlorophyll + light)-> C6H12O6 + O2
CO2 - Atmosphere 0.03%
Photosynthesis reduces atmospheric CO2
2. Feeding
Passage of carbon through different trophic levels
Producer -> Primary consumer -> Secondary consumer
Primary con. takes carbon molecules from producer etc..
Carbon is passed down through chain
3. Respiration
C6H12O6 + O2 -(enzymes in cell)-> Energy + CO2 + H2O
Adds CO2 to atmosphere
(All trophic levels/consumers/producers respire)
4. Decomposition
All organisms die
Organic molecules -(bacteria, fungi)-> CO2
Decomposition releases CO2
5. Combustion
a) Fossil fuels [oils, coals] -> CO2
(formed by compression and pressure of biomass)
industrial/cars, lorries etc
b) Occurrence in environment naturally
e.g. Lightning striking trees, causing forest fires etc
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http://www.windows2universe.org/earth/climate/images/carboncycle_sm.jpg |
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