NITROGEN CYCLE

1. NITROGEN CYCLE

2. gen Cycle Nitro • Composes about four-fifths (78.03 percent) by volume of the atmosphere • an essential part of the amino acids. It is a basic element of life. • is an important element in plant nutrition • in the form of protein is an important constituent of animal tissue.

3. Nitrogen Cycle • natural cyclic process in the course of which atmospheric nitrogen enters the soil and becomes part of living organisms

4. Nitrogen Cycle

5. Amounts of Nitrogen

6. Forms of Nitrogen in Ocean

7. Steps of Nitrogen Cycle • Nitrogen Fixation • Nitrogen Assimilation • Ammonification • Nitrification • Denitrification

8. Nitrogen Fixation • Nitrogen gas is converted into inorganic nitrogen compounds. It is mostly (90 percent) accomplished by free-living, nitrogen-fixing bacteria.

9. Nitrogen-Fixing Bacteria • symbiotic bacteria living on the roots of plants (mostly legumes and alders) • cyanobacteria (formerly known as blue-green algae) • archaebacteria (also known as archaea) in deep-sea hydrothermal vents

10. Nitrogen Fixation by Lightning • The high energies provided by lightning and cosmic radiation serve to combine atmospheric nitrogen and oxygen into nitrates, which are carried to the Earth’s surface in precipitation.

11. Steps of Nitrogen Cycle • Nitrogen Fixation • Nitrogen Assimilation • Ammonification • Nitrification • Denitrification

12. Nitrogen Assimilation • are assimilation of nitrates and ammonia resulting from nitrogen fixation into the specific tissue compounds of algae and higher plants. Animals then ingest these algae and plants, converting them into their own body compounds.

13. Steps of Nitrogen Cycle • Nitrogen Fixation • Nitrogen Assimilation • Ammonification • Nitrification • Denitrification

14. Ammonification • The remains of all living things—and their waste products—are decomposed by microorganisms which yields ammonia.

15. Steps of Nitrogen Cycle • Nitrogen Fixation • Nitrogen Assimilation • Ammonification • Nitrification • Denitrification

16. Nitrification • a process carried out by nitrifying bacteria, transforms soil ammonia into nitrates, which plants can incorporate into their own tissues. • 1rst step catalyzed by Nitrosomonas 2 NH4+ + 3 O2 2 NO2- +2 H2O+ 4 H+ • 2nd step catalyzed by Nitrobacter • 2 NO2- + O2  2 NO3-

17. Steps of Nitrogen Cycle • Nitrogen Fixation • Nitrogen Assimilation • Ammonification • Nitrification • Denitrification

18. Denitrification • The process where nitrates are metabolized by denitrifying bacteria to free nitrogen and returned to the atmosphere

19. Nitrogen Cycle in Ocean • In groups construct a poster or drawing diagram about how the Nitrogen Cycle would work in the ocean • Label steps (Nitrogen Fixation, Nitrogen Assimilation, Ammonification, Nitrification, Denitrification)

20. Nitrogen Cycle In Ocean

21. Nitrogen Cycle in Fish Tanks