1. Cycles

2. The Carbon Cycle - Terrestrial
secondary
consumers
dead waste
respiration
primary
decomposers
dead waste
Atmosphere
O2 & CO2
producers
(plants)
carbon
photosynthesis
Carbon dioxide (CO2) Oxygen (O2)

3. Carbon Cycle - terrestrial
Decomposers take in O2 to digest dead waste from consumers and producers and give off CO2
Consumers take in O2 and give off CO2
Producers take in O2 and give off CO2 (respiration)
Producers take in CO2 and give off O2 (photosynthesis)

4. The Carbon Cycle - Aquatic
consumers
decomposers
dead waste
producers
photosynthesis
respiration
Carbon in shells of animals
Carbon in sediments
CO2 dissolved in solution (carbonic acid)
CO2 in the
atmosphere
The Carbon Cycle - Aquatic

5. Carbon Cycle - Aquatic
Producers give off CO2 during cellular respiration
Producers take in CO2 during photosynthesis
Consumers give off CO2 during cellular respiration
CO2 in the atmosphere is absorbed by water in the form of carbonic acid.
Animals use carbon to make shells
Decomposers give off CO2 when digesting waste

6. Nitrogen (N) HONC Nitrogen is a main component of proteins and DNA
The most common elements found in living things are Hydrogen, Oxygen, Nitrogen, and Carbon
Nitrogen is a main component of proteins and DNA
Nitrogen (N) along with potassium (K) and phosphorus (P) are the main ingredients of fertilizers.
While fertilizer is good for a plant, too much can kill or damage the plant.

7. Lake
Winnipeg

8. Nitrogen (N) helps plants turn green
Phosphorus (P) helps plants to flower
Potassium (K) is important for overall growth
Too much nitrogen can “burn” or kill a crop as in the case when an animal urinates on your lawn

9. The Nitrogen Cycle - Terrestrial
Nitrogen in atmosphere
Producers
Consumers
Nitrogen in tissues
Decomposers
Nitrogen fixing bacteria
Nitrifying bacteria
Denitrifying bacteria
Nitrates
Ammonia

10. *Organisms can’t absorb nitrogen gas (N2) directly*
Nitrogen atoms must first be pulled out of the air and “fixed”(bonded) to other elements to form new compounds (such as ammonia) with the help of nitrogen fixing bacteria. This process is called nitrogen fixation.
Nitrifying bacteria convert this ammonia into nitrates. Nitrates can be then used by plants for a source of nitrogen. They can also do this from the ammonia from decomposing organisms.
Denitrifying bacteria convert nitrates back into nitrogen gas by a process called denitrification.
NOTE: Animals can only obtain nitrogen from eating other organisms!