Nutrient Cycles

4. This element is needed by organisms in to make carbohydrates, fats and other types of complex compounds
7. Nitrogen containing compound found in urine.
11. These organisms convert ammonium ions to nitrites and then nitrites to nitrate ions
12. These nutrients are obtained by consumers when they feed on plants in the nitrogen cycle
13. Process by which plants absorb carbon as CO2 and use it to make carbon compounds eg. glucose
15. Process by which fungi break down nutrients in dead and decaying materials
16. This process converts nitrates to N2
17. All organisms do this process which results in the release of carbon as carbon dioxide into the atmosphere
18. Plant roots take up water and dissolved nutrients eg. nitrates and ammonium ions via this process
19. fuel Source of fuel that man uses to make other energy forms eg. heat and electricity
20. Process during which fossil fuels are formed over numerous years under high temperature and pressure.
21. These bacteria convert N2 in the atmosphere to nitrates and ammonium ions

1. Microbes in the soil that use nitrate and during which N2 forms
2. Process of burning organic material eg. fossil fuels
3. Swollen sections of the roots of legume plants in which important bacteria live.
5. A useable form of nitrogen found in the soil that plants absorb.
6. There is 0.03% of this gas in the atmosphere.It is a source of carbon for plants.
8. This element is needed by organisms to make amino acids and subsequently proteins and also DNA
9. 80% of nitrogen exists in the atmosphere in this form
10. process by which N2 in the atmosphere is converted to useable forms eg. nitrates and ammonium ions
11. Process of converting ammonium ions to nitrites and nitrites to nitrates
14. Term that describes the unreactive nature of nitrogen gas.
20. are major types of decomposers