Nitrogen Cycle � The nitrogen cycle moves nitrogen from the air to the soil, into living things and back into the soil and back into the air. � Most organisms can’t use “Free” nitrogen (gas) � Nitrogen Fixation: this is the process that changes “free “ nitrogen into useable nitrogen � Most nitrogen fixation is done by bacteria (commonly found on plant roots)(legumes) � Once nitrogen has been “fixed” it can be used by organisms.
Nitrogen cycle � Plants and animals absorb the nitrogen � Decomposers break down their waste and dead plant material and return the nitrogen back to the soil � Bacteria then absorbs the nitrogen and converts it back into “Free” nitrogen gas by the process of denitrification. � Nitrogen can cycle through plants and animals many times but eventually is returned to the air
Examples of the Nitrogen Cycle
What are the 2 most abundant gasses in Earth’s atmosphere? A. B. C. D. E. Oxygen and carbon Nitrogen and hydrogen Oxygen and nitrogen Oxygen and ozone This is just a guess
Which process in the Carbon Cycle, involves plants using carbon dioxide to make their own food? A. B. C. D. E. Respiration Condensation Photosynthesis Combustion I’ve fallen and I can’t get up
Which process, in the Nitrogen Cycle, converts nitrogen from the air into a usable form for plants and animals? A. B. C. D. E. Nitrogen fixation Denitrification Respiration Evaporation Please, please help me!