1. Nitrogen Cycle
Ch.2.2

2. Bacteria Decomposers in the Nitrogen Cycle

3. Bacteria as decomposers:

4. Legumes: Root nodules Legumes are plants with root nodules
Fix nitrogen in soil
Using Bacteria
Produce usable Nitrate

5. Legumes have root nodules

6. Nitrogen Diagram:
A-C Nitrogen gas is fixed by lightning to nitrate in the soil (Nitrogen fixation)
B-G Ammonia from waste decomposes to nitrite by bacteria (nitrification)
G-C Nitrite is converted to nitrate by bacteria (nitrification)

7. D-A Soil nitrate becomes nitrogen gas (denitrification)
C-E Nitrate is used as fertilizer by plants
E-F plant protein nitrogen becomes animal protein when eaten
F-B Animal protein waste decomposes to ammonia by bacteria

8. IV. Nitrogen cycle: Plants only use nitrate
Muscle tissue is made of amino acids
Decomposition of protein makes ammonia
Ammonia converts to nitrite
Nitrite converts to nitrate

9. V. Nitrogen Cycle Nitrification: ammonia to nitrite
& nitrite to nitrate by bacteria in the soil
Denitrification: nitrate to nitrogen gas by bacteria
Decompostion: ammonia in wastes to nitrite by bacteria
Nitrogen fixation: nitrogen gas to nitrateby lightning or nitrite by plant/ bacteria