1. Cycles in Nature
Ch. 25-2
EQ: How does matter move among the biotic and abiotic parts of an ecosystem?

2. Recycling in the Biosphere
Energy and matter move through the biosphere very differently
Unlike the one-way flow of energy, matter is recycled within and between ecosystems

3. Evaporation/Transpiration
The Water Cycle
Precipitation
Runoff
Seepage
Evaporation/Transpiration
Condensation

4. What these term mean: Precipitation – Rain, snow, hail, mist
Runoff – water running down a hill/ mountain
Seepage – water going into the ground
Evaporation – water going into the air (think steam)
Transpiration – water going into the air from the water that is in plants and animals
Condensation – Water forming clouds

5. Water moves between the ocean, atmosphere and land.

6. Nutrient Cycles
A nutrient is a chemical substance that an organism needs to sustain life
Similar to water, nutrients are passed between organisms and the environment through cycles

7. Carbon Cycle
The carbon cycle starts with producers removing CO2 from the air during photosynthesis
They use this to make sugars that make up their structure which other animals eat.
Energy is released from these molecules during respiration.
Respiration uses oxygen and releases CO2.
Photosynthesis then uses that CO2 and the cycle starts again.

8. Carbon Cycle

9. Nitrogen Cycle All organisms require nitrogen to make proteins.
Only certain types of bacteria can use the nitrogen in the air
Such bacteria live in the soil and on the roots of some plants. They convert nitrogen gas into ammonia in a process called nitrogen fixation

10. Nitrogen Cycle key terms:
Nitrogen fixation – turns nitrogen in the air into ammonia.
Nitrification – turns ammonia into a useful form called nitrate
Denitrification – changes the Nitrate to nitrogen gas.
Assimilation – Plants or animals taking in the useful nitrogen (Nitrate)
Ammonification – Animal waste that goes into the ground (think cow manure/ fertilizer)

11. Nitrogen Cycle
Copy again

12. Question 1 Transpiration is part of the Water cycle Carbon cycle
Nitrogen cycle
Nutrient cycle

13. Question 2 Carbon is found in the atmosphere in the form of
Carbohydrates
Carbon dioxide
Calcium carbonate
ammonia

14. Question 3
The only organism that can covert nitrogen in the atmosphere into a form useful to living things are nitrogen fixing
Plants
Bacteria
Detritivores
animals