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Carbon cycle

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Matea Veselcic

on 2 July 2015

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Transcript of Carbon cycle

Water from the soil
Assimilation
Carbon exists in the atmosphere as the greenhouse gas carbon dioxide
CO2
Light energy
H20
approximately 0.04% of the atmosphere is made up of carbon dioxide.
O2
2.a) atmosphere
Pores (stomata) allows CO2 to diffuse
Light energy splits the water molecules into oxygen and hydrogen
light energy
Water
Oxygen is released as a waste product
hydrogen and carbon dioxide react to form glucose, catalysed by enzymes
Oxygen
the amount has increased by 30% within the past 150 years due to the burning of fossil fuels
CARBON CYCLE
Structure
1. General information about carbon
2. carbon exchange between different reservoirs
a) atmosphere
b) plants
c) animals
is an abundant element of the universe
carbon circulates and transforms between living (biotic) things and the non-living (abiotic) things in the environment
Organic compounds present in the non-living (abiotic) environment
are present in fossil fuels
e.g. peat, coal, oil
Organic compounds present in the living (biotic) environment
are present in plants
e.g carbohydrates, fats and proteins
are present in animals
e.g carbohydrates, fats and proteins
are present in decomposers such as bacteria and fungi
http://teeic.indianaffairs.gov/er/carbon/carboninfo/cycle/
http://globecarboncycle.unh.edu/CarbonPoolsFluxes.shtml
https://www.abiweb.de/biologie-oekologie/oekosysteme/stoffkreis.html
https://www.windows2universe.org/earth/climate/carbon_cycle.html
http://www.columbia.edu/~vjd1/carbon.htm
http://www.newworldencyclopedia.org/entry/Carbon_cycle
http://www.epa.gov/climatestudents/basics/today/carbon-dioxide.html

Books:
"Complete biology" p.156-157, 164, 214, 252, 254-255
1. General information about carbon
glucose is used for growth and as a source of energy
is the basis of organic molecules
carbon cycle is a closed system
- to facilitate growth
- to release it as solid waste
Animals need to consume plants/ other animals that eat plants...
glucose is oxidised ("burned") by oxygen to release energy
carbon dioxide and water are waste products of these reactions
2.c) Animals
Glucose
+
Oxygen
carbon
dioxide
+
water
+
energy
Cellular respiration
2.d) Soil
solid waste and remains of dead animals/plants is food for decomposers (bacteria and fungi)
chlorophyll (a pigment found in chloroplasts) absorbs light energy
d) soil
CO2
dissimilation
decomposers break down large complex molecules in animal and plant remains into simpler compounds in the soil and atmosphere
CO2
C
fossilization
over a long period of time, heat and pressure turn dead animals into fossil fuels
CO2
C
C
C
CO2
2.a) Plants
- to use it as an energy source
takes in approximately 20-25 million tonnes carbon dioxide from the atmosphere every day
cold water absorbs more carbon dioxide
3. Human impacts on the carbon cycle
inorganic CO2 is absorbed and released at the interface of the oceans surface by diffusion
water close to the surface becomes more acidic
2.e) Ocean surface
CO2
2.f) Marine life
algae, tiny organisms such as phytoplankton assimilate co2 through photosynthesis
marine animals (fish) use e.g. phytoplankton as an energy source
sedimentation
marine animals die and sink down to the deep ocean
Sediments
marine animals release CO2 through respiration
transported from one reservoir to the next
CO2 is released through this process
carbon cycle
CO2
decomposers release CO2
5. Sources
2.g) Deep ocean
dead animals don't completely decompose
marine animals provide for organic material with their excrements, which then breaks and settles down
contains 65% of the Earth's carbon
end up buried in layers
e) ocean surface
f) marine life
4. Carbon song
3. Human impacts on the carbon cycle
through e.g. burning of biomass fuels (wood, alcohol) and combustion of fossil fuels, CO2 is released into the atmosphere
humans have exploited fossil fuels as a source of energy over a short time
more CO2 gets in the atmosphere and the Earth gets warmer
ice shelves start melting and ocean heats up ( ->trapped carbon is released into the atmosphere)
2.a) Plants
g) deep ocean
5.Sources
plants are build up of carbon
balance of carbon cycle is disrupted
use carbon dioxide to gain energy and to grow
-> can only happen thanks to photosynthesis
Photosynthesis
water from the soil enters
2.c) Animals
4. Carbon song

glucose (organic compound) is converted into CO2 (inorganic compound) -> dissimilation
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