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1. THE NITROGEN CYCLE

2. NITROGEN
is an essential component of the different
molecules found in all living things. It is
used by organisms to build proteins and
nucleic acids. Although nitrogen makes up
78.9% of the atmosphere, animals and
plants however cannot use it directly.
Hi! I am Nitrogen

3. Although nitrogen makes up 78.9% of the
atmosphere, animals and plants however
cannot use it directly.
We cannot use you!

4. We cannot use you!

5. You must be converted into
Nitrogenous compound
Nitrogen must be converted
into nitrogenuous
compound through the
process
NITROGEN FIXATION

6. I am a Leguminous Plant. I
can convert you into a
nitrogenous compound
through my roots

7. Go down inside my roots

9. Rhizobium house
We are the Rhizobium
bacteria. We live in the root
nodules of leguminous plants

10. Rhizobium house
We can convert you into
Ammonia
Nitrogen will be converted
by nitrogen-fixing bacteria
by the process called
AMMONIFICATION

11. Rhizobium house

12. Rhizobium house
We are Ammonia
(NH3)

13. Rhizobium house
It is not enough.
You must undergo
another conversion

14. Hello Ammonia! I am a
Nitrifying bacteria
NitratesNitrites

15. Ammonia will then be
converted by a nitrifying
bacteria into Nitrates and
Nitrites through the process
NITRIFICATION
NitratesNitrites

16. NitratesNitrites

17. Nitrates NO3
-Nitrites NO2
-

18. NITROGEN FIXATION
can also occur by lightning strikes

19. NITROGEN FIXATION
can also occur by lightning strikes

20. Nitrates NO3
-
Plants absorbs these
nitrates from the soil

21. Plants use these nitrates
to make PROTEINS

22. Animals eat plants to
get proteins

23. Dead plants and animal
excreta contain
nitrogenous wastes

24. Overtime, these wastes
decay and Ammonia is
released

25. NitratesNitrites
Ammonia gets converted
into Nitrates

26. Nitrates NO3
-Nitrites NO2
-
Ammonia gets converted
into Nitrates

27. Nitrates NO3
-
Some nitrates are again
used by plants

28. Hello Nitrates! I am a Denitrifying
bacteria! I am going to convert
you back to Nitrogen

29. Nitrates are being
converted back to
atmospheric Nitrogen
through the help of
Denitrifying bacteria

30. Nitrates are being
converted back to
atmospheric Nitrogen
through the help of
Denitrifying bacteria
I’m baaaaack!

31. Nitrogen gas goes back to
the atmosphere

32. Nitrogen gas goes back to
the atmosphere

33. Nitrogen gas goes back to
the atmosphere

34. Nitrogen gas goes back to
the atmosphere

35. Rhizobium bacteria
Ammonia
Nitrates
Nitrifying bacteria
Lightning strike
Plants absorb
nitrates to make
proteins
Animals eat plants
to get proteins
Nitrogenous waste
Ammonia
Nitrifying bacteria
Denitrifying bacteria

36. SHORT QUIZ

37. 1. It is the process of converting nitrogen
into a more useful nitrogenous compound

38. 2. This is the first part of nitrogen
fixation

39. 3. These are the bacteria that converts
the atmospheric nitrogen into ammonia

40. 4. It is the second process of nitrogen
fixation

41. 5 and 6. (with chemical formula)
Nitrifying bacteria will converted
ammonia into two substances called
________ and ___________

42. 7. Nitrification can also happen in the
atmosphere with the help of
___________________________

43. 8. Dead plants and animal manures when
decayed will produce
_______________________

44. 9. These nitrogen fixing bacteria converts
nitrates back to being an atmospheric
nitrogen

45. 10. Animals use nitrates to produce
_________________